update docs

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

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

 # WLAN
+This **wifiext** module provides WLAN extension interfaces for non-universal products.
 
-> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**<br/>
+> ![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 APIs described in this document are used only for non-universal products, such as routers.
 
@@ -17,13 +18,11 @@ enableHotspot(): boolean;
 
 Enables the WLAN hotspot.
 
-- Required permissions:
-  ohos.permission.MANAGE_WIFI_HOTSPOT_EXT
+**Required permissions**: ohos.permission.MANAGE_WIFI_HOTSPOT_EXT
 
-- System capability:
-  SystemCapability.Communication.WiFi.AP.Extension
+**System capability**: SystemCapability.Communication.WiFi.AP.Extension
 
-- Return value
+**Return value**
   | **Type**| **Description**|
   | -------- | -------- |
   | boolean | Returns **true** if the operation is successful; returns **false** otherwise.|
@@ -35,13 +34,11 @@ disableHotspot(): boolean;
 
 Disables the WLAN hotspot.
 
-- Required permissions:
-  ohos.permission.MANAGE_WIFI_HOTSPOT_EXT
+**Required permissions**: ohos.permission.MANAGE_WIFI_HOTSPOT_EXT
 
-- System capability:
-  SystemCapability.Communication.WiFi.AP.Extension
+**System capability**: SystemCapability.Communication.WiFi.AP.Extension
 
-- Return value
+**Return value**
   | **Type**| **Description**|
   | -------- | -------- |
   | boolean | Returns **true** if the operation is successful; returns **false** otherwise.|
@@ -51,24 +48,24 @@ Disables the WLAN hotspot.
 
 getSupportedPowerModel(): Promise&lt;Array&lt;PowerModel&gt;&gt;
 
-Obtains the supported power models. The method uses a promise to return the result.
+Obtains the supported power models. This API uses a promise to return the result.
 
-- Required permissions:
-  ohos.permission.GET_WIFI_INFO
+**Required permissions**: ohos.permission.GET_WIFI_INFO
 
-- System capability:
-  SystemCapability.Communication.WiFi.AP.Extension
+**System capability**: SystemCapability.Communication.WiFi.AP.Extension
 
-- Return value
+**Return value**
   | Type| Description|
   | -------- | -------- |
-  | Promise&lt;Array&lt;[PowerModel](#PowerModel)&gt;&gt; | Promise used to return the power models obtained.|
+  | Promise&lt;Array&lt;[PowerModel](#powermodel)&gt;&gt; | Promise used to return the power models obtained.|
 
 
 ## PowerModel
 
 Enumerates of the power models.
 
+**System capability**: SystemCapability.Communication.WiFi.AP.Extension
+
 | Name| Default Value| Description|
 | -------- | -------- | -------- |
 | SLEEPING | 0 | Sleeping|
@@ -80,54 +77,48 @@ Enumerates of the power models.
 
 getSupportedPowerModel(callback: AsyncCallback&lt;Array&lt;PowerModel&gt;&gt;): void
 
-Obtains the supported power models. The method uses an asynchronous callback to return the result.
+Obtains the supported power models. This API uses an asynchronous callback to return the result.
 
-- Required permissions:
-  ohos.permission.GET_WIFI_INFO
+**Required permissions**: ohos.permission.GET_WIFI_INFO
 
-- System capability:
-  SystemCapability.Communication.WiFi.AP.Extension
+**System capability**: SystemCapability.Communication.WiFi.AP.Extension
 
-- Parameters
+**Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
-  | callback | AsyncCallback&lt;[PowerModel](#PowerModel)&gt; | Yes| Callback used to return the power models obtained.|
+  | callback | AsyncCallback&lt;[PowerModel](#powermodel)&gt; | Yes| Callback invoked to return the result. If the operation is successful, **err** is 0 and **data** is the power models obtained. If **err** is not **0**, an error has occurred.|
 
 
 ## wifiext.getPowerModel
 
 getPowerModel(): Promise&lt;PowerModel&gt;
 
-Obtains the power model. The method uses a promise to return the result.
+Obtains the power model. This API uses a promise to return the result.
 
-- Required permissions:
-  ohos.permission.GET_WIFI_INFO
+**Required permissions**: ohos.permission.GET_WIFI_INFO
 
-- System capability:
-  SystemCapability.Communication.WiFi.AP.Extension
+**System capability**: SystemCapability.Communication.WiFi.AP.Extension
 
-- Return value
+**Return value**
   | Type| Description|
   | -------- | -------- |
-  | Promise&lt;[PowerModel](#PowerModel)&gt; | Promise used to return the power model obtained.|
+  | Promise&lt;[PowerModel](#powermodel)&gt; | Promise used to return the power model obtained.|
 
 
 ## wifiext.getPowerModel
 
 getPowerModel(callback: AsyncCallback&lt;PowerModel&gt;): void
 
-Obtains the power model. The method uses an asynchronous callback to return the result.
+Obtains the power model. This API uses an asynchronous callback to return the result.
 
-- Required permissions:
-  ohos.permission.GET_WIFI_INFO
+**Required permissions**: ohos.permission.GET_WIFI_INFO
 
-- System capability:
-  SystemCapability.Communication.WiFi.AP.Extension
+**System capability**: SystemCapability.Communication.WiFi.AP.Extension
 
-- Parameters
+**Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
-  | callback | AsyncCallback&lt;[PowerModel](#PowerModel)&gt; | Yes| Callback invoked to return the power mode obtained.|
+  | callback | AsyncCallback&lt;[PowerModel](#powermodel)&gt; | Yes| Callback invoked to return the result. If the operation is successful, **err** is **0** and **data** is the power mode obtained. If **err** is not **0**, an error has occurred.|
 
 
 ## wifiext.setPowerModel
@@ -136,18 +127,16 @@ setPowerModel(model: PowerModel) : boolean;
 
  Sets the power model.
 
-- Required permissions:
-  ohos.permission.MANAGE_WIFI_HOTSPOT_EXT
+**Required permissions**: ohos.permission.MANAGE_WIFI_HOTSPOT_EXT
 
-- System capability:
-  SystemCapability.Communication.WiFi.AP.Extension
+**System capability**: SystemCapability.Communication.WiFi.AP.Extension
 
-- Parameters
+**Parameters**
   | Name| Type| Mandatory| Description|
   | -------- | -------- | -------- | -------- |
-  | model | AsyncCallback&lt;[PowerModel](#PowerModel)&gt; | Yes| Power model to set.|
+  | model | AsyncCallback&lt;[PowerModel](#powermodel)&gt; | Yes| Power model to set.|
 
-- Return value
+**Return value**
   | **Type**| **Description**|
   | -------- | -------- |
   | boolean | Returns **true** if the operation is successful; returns **false** otherwise.|