update docs

Signed-off-by: Nannie_wangli <annie.wangli@huawei.com>

en/application-dev/reference/apis/js-apis-statfs.md

 # statfs
 
-> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE:**
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE:**<br/>
 > The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 
 ## Modules to Import
@@ -9,7 +9,7 @@
 import statfs from '@ohos.statfs';
 ```
 
-## Note
+## Guidelines
 
 Before using this module to perform operations on a file or directory, obtain the absolute path of the file or directory. For details, see [getOrCreateLocalDir of the Context module](js-apis-Context.md).
 
@@ -21,27 +21,25 @@ For example, if the application directory obtained by using **getOrCreateLocalDi
 let path = dir + "xxx.txt";
 ```
 
-## System Capabilities
-
-SystemCapability.FileManagement.File.FileIO
-
 ## statfs.getFreeBytes
 
 getFreeBytes(path:string):Promise&lt;number&gt;
 
 Obtains the number of free bytes of the specified file system in asynchronous mode. This method uses a promise to return the result.
 
-- Parameters
+**System capability**: SystemCapability.FileManagement.File.FileIO
+
+- **Parameters**
 
-  | Name| Type| Mandatory| Description|
+  | Name| Type  | Mandatory| Description                        |
   | ------ | ------ | ---- | ---------------------------- |
-  | path   | string | Yes| File path of the file system.|
+  | path   | string | Yes  | File path of the file system.|
 
-- Return values
+- Return value
 
-  | Type| Description|
+  | Type                 | Description          |
   | --------------------- | -------------- |
-  | Promise&lt;number&gt; | Number of free bytes obtained.|
+  | Promise&lt;number&gt; | Promise used to return the number of free bytes obtained.|
 
 - Example
 
@@ -60,38 +58,42 @@ getFreeBytes(path:string, callback:AsyncCallback&lt;number&gt;): void
 
 Obtains the number of free bytes of the specified file system in asynchronous mode. This method uses a callback to return the result.
 
-- Parameters
+**System capability**: SystemCapability.FileManagement.File.FileIO
 
-  | Name| Type| Mandatory| Description|
+- **Parameters**
+
+  | Name  | Type                       | Mandatory| Description                        |
   | -------- | --------------------------- | ---- | ---------------------------- |
-  | path     | string                      | Yes| File path of the file system.|
-  | callback | AsyncCallback&lt;number&gt; | Yes| Callback invoked to return the number of free bytes obtained.|
+  | path     | string                      | Yes  | File path of the file system.|
+  | callback | AsyncCallback&lt;number&gt; | Yes  | Callback invoked to return the number of free bytes obtained.|
 
 - Example
 
   ```js
   statfs.getFreeBytes(path, function(err, number){
-      // Do something.
+      //do something
   });
   ```
 
 ## statfs.getTotalBytes
 
-getTotalBytes.(path:string):Promise&lt;number&gt;
+getTotalBytes(path: string): Promise&lt;number&gt;
 
 Obtains the total number of bytes of the specified file system in asynchronous mode. This method uses a promise to return the result.
 
-- Parameters
+**System capability**: SystemCapability.FileManagement.File.FileIO
+
+- **Parameters**
 
-  | Name| Type| Mandatory| Description|
+  | Name| Type  | Mandatory| Description                        |
   | ---- | ------ | ---- | ---------------------------- |
-  | path | string | Yes| File path of the file system.|
+  | path | string | Yes  | File path of the file system.|
 
-- Return values
+- Return value
 
-  | Type| Description|
+  | Type                 | Description        |
   | --------------------- | ------------ |
-  | Promise&lt;number&gt; | Total number of bytes obtained.|
+  | Promise&lt;number&gt; | Promise used to return the total number of bytes obtained.|
 
 - Example
 
@@ -106,21 +108,23 @@ Obtains the total number of bytes of the specified file system in asynchronous m
 
 ## statfs.getTotalBytes
 
-getTotalBytes(path:string, callback:AsyncCallback&lt;number&gt;): void
+getTotalBytes(path: string, callback: AsyncCallback&lt;number&gt;): void
 
 Obtains the total number of bytes of the specified file system in asynchronous mode. This method uses a callback to return the result.
 
-- Parameters
+**System capability**: SystemCapability.FileManagement.File.FileIO
+
+- **Parameters**
 
-  | Name| Type| Mandatory| Description|
+  | Name  | Type                       | Mandatory| Description                        |
   | -------- | --------------------------- | ---- | ---------------------------- |
-  | path     | string                      | Yes| File path of the file system.|
-  | callback | AsyncCallback&lt;number&gt; | Yes| Callback invoked to return the total number of bytes obtained.|
+  | path     | string                      | Yes  | File path of the file system.|
+  | callback | AsyncCallback&lt;number&gt; | Yes  | Callback invoked to return the total number of bytes obtained.  |
 
 - Example
 
   ```js
   statfs.getTotalBytes(path, function(err, number){
-      // Do something.
+      //do something
   });
   ```

en/application-dev/reference/apis/js-apis-volumemanager.md

 # Volume Management
 
-> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
+> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**<br/>
 >
-> The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+> - The initial APIs of this module are supported since API version 8. Newly added APIs will be marked with a superscript to indicate their earliest API version.
+> - This is a system API and cannot be called by third-party applications.
 
 ## Modules to Import
 
 ```js
-import volumemanager from "@ohos.volumemanager";
+import volumemanager from "@ohos.volumeManager";
 ```
 
-## System Capabilities
+## volumemanager.getAllVolumes<sup>9+</sup>
 
-SystemCapability.FileManagement.StorageService.Volume
-
-## volumemanager.getAllVolumes
-
-getAllVolumes(): Promise&lt;Volume[]&gt;
+getAllVolumes(): Promise&lt;Array&lt;Volume&gt;&gt;
 
 Asynchronously obtains information about all available volumes. This method uses a promise to return the result.
 
+**System capability**: SystemCapability.FileManagement.StorageService.Volume
+
 - Return value
 
-  | Type| Description|
+  | Type                              | Description                      |
   | ---------------------------------- | -------------------------- |
   | Promise&lt;[Volume](#volume)[]&gt; | Promise used to return the execution result.|
 
@@ -34,17 +33,19 @@ Asynchronously obtains information about all available volumes. This method uses
   });
   ```
 
-## volumemanager.getAllVolumes
+## volumemanager.getAllVolumes<sup>9+</sup>
 
-getAllVolumes(callback:AsyncCallback&lt;Volume[]&gt;):void
+getAllVolumes(callback: AsyncCallback&lt;Array&lt;Volume&gt;&gt;): void
 
 Asynchronously obtains information about all available volumes. This method uses a callback to return the result.
 
+**System capability**: SystemCapability.FileManagement.StorageService.Volume
+
 - Parameters
 
-  | Name| Type| Mandatory| Description|
+  | Name  | Type                                             | Mandatory| Description                                |
   | -------- | ------------------------------------------------- | ---- | ------------------------------------ |
-  | callback | callback:AsyncCallback&lt;[Volume](#volume)[]&gt; | Yes| Callback invoked to return the volume information obtained.|
+  | callback | callback:AsyncCallback&lt;[Volume](#volume)[]&gt; | Yes  | Callback invoked to return the volume information obtained.|
   
 - Example
 
@@ -56,21 +57,23 @@ Asynchronously obtains information about all available volumes. This method uses
   ```
 
 
-## volumemanager.mount
+## volumemanager.mount<sup>9+</sup>
 
 mount(volumeId: string): Promise&lt;boolean&gt;
 
 Asynchronously mounts a volume. This method uses a promise to return the result.
 
+**System capability**: SystemCapability.FileManagement.StorageService.Volume
+
 - Parameters
 
-  | Name| Type| Mandatory| Description|
+  | Name  | Type  | Mandatory| Description|
   | -------- | ------ | ---- | ---- |
-  | volumeId | string | Yes| Volume ID.|
+  | volumeId | string | Yes  | Volume ID.|
 
 - Return value
 
-  | Type| Description|
+  | Type                  | Description      |
   | ---------------------- | ---------- |
   | Promise&lt;boolean&gt; | Promise used to return the execution result.|
 
@@ -83,18 +86,20 @@ Asynchronously mounts a volume. This method uses a promise to return the result.
   });
   ```
 
-## volumemanager.mount
+## volumemanager.mount<sup>9+</sup>
 
 mount(volumeId: string, callback:AsyncCallback&lt;boolean&gt;):void
 
-Asynchronously mounts a volume. This method uses a callback to return the result.
+Asynchronously obtains the available space of the specified volume. This method uses a callback to return the result.
+
+**System capability**: SystemCapability.FileManagement.StorageService.Volume
 
 - Parameters
 
-  | Name| Type| Mandatory| Description|
+  | Name  | Type                                 | Mandatory| Description                |
   | -------- | ------------------------------------- | ---- | -------------------- |
-  | volumeId | string                                | Yes| Volume ID.|
-  | callback | callback:AsyncCallback&lt;boolean&gt; | Yes| Callback invoked to return the execution result.|
+  | volumeId | string                                | Yes  | Volume ID.                |
+  | callback | callback:AsyncCallback&lt;boolean&gt; | Yes  | Callback invoked to return the execution result.|
 
 - Example
 
@@ -105,21 +110,23 @@ Asynchronously mounts a volume. This method uses a callback to return the result
   });
   ```
 
-## volumemanager.unmount
+## volumemanager.unmount<sup>9+</sup>
 
 unmount(volumeId: string): Promise&lt;boolean&gt;
 
 Asynchronously unmounts a volume. This method uses a promise to return the result.
 
+**System capability**: SystemCapability.FileManagement.StorageService.Volume
+
 - Parameters
 
-  | Name| Type| Mandatory| Description|
+  | Name  | Type  | Mandatory| Description|
   | -------- | ------ | ---- | ---- |
-  | volumeId | string | Yes| Volume ID.|
+  | volumeId | string | Yes  | Volume ID.|
 
 - Return value
 
-  | Type| Description|
+  | Type                  | Description      |
   | ---------------------- | ---------- |
   | Promise&lt;boolean&gt; | Promise used to return the execution result.|
 
@@ -132,18 +139,20 @@ Asynchronously unmounts a volume. This method uses a promise to return the resul
   });
   ```
 
-## volumemanager.unmount
+## volumemanager.unmount<sup>9+</sup>
 
 unmount(volumeId: string, callback:AsyncCallback&lt;boolean&gt;):void
 
 Asynchronously unmounts a volume. This method uses a callback to return the result.
 
+**System capability**: SystemCapability.FileManagement.StorageService.Volume
+
 - Parameters
 
-  | Name| Type| Mandatory| Description|
+  | Name  | Type                                 | Mandatory| Description                |
   | -------- | ------------------------------------- | ---- | -------------------- |
-  | volumeId | string                                | Yes| Volume ID.|
-  | callback | callback:AsyncCallback&lt;boolean&gt; | Yes| Callback invoked to return the execution result.|
+  | volumeId | string                                | Yes  | Volume ID.                |
+  | callback | callback:AsyncCallback&lt;boolean&gt; | Yes  | Callback invoked to return the execution result.|
 
 - Example
 
@@ -154,15 +163,17 @@ Asynchronously unmounts a volume. This method uses a callback to return the resu
   });
   ```
 
-## Volume
+## Volume<sup>9+</sup>
+
+**System capability**: SystemCapability.FileManagement.StorageService.Volume
 
 ### Attributes
 
-| Name| Type| Description|
+| Name       | Type   | Description                |
 | ----------- | ------- | -------------------- |
-| id          | number  | Volume ID.|
-| uuid        | string  | Universally unique identifier (UUID) of the volume.|
-| description | string  | Description of the volume.|
-| removeAble  | boolean | Whether the volume is a removable storage device.|
-| state       | int     | Current volume status.|
-| path        | string  | Mount address of the volume.|
+| id<sup>9+</sup>          | number  | Volume ID.                |
+| uuid<sup>9+</sup>        | string  | Universally unique identifier (UUID) of the volume.              |
+| description<sup>9+</sup> | string  | Description of the volume.          |
+| removable<sup>9+</sup> | boolean | Whether the volume is a removable storage device.|
+| state<sup>9+</sup>       | int     | Current volume status.          |
+| path<sup>9+</sup>        | string  | Mount address of the volume.        |