update docs

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

en/application-dev/reference/apis/Readme-EN.md

@@ -240,7 +240,7 @@
   - [@ohos.file.fileUri (File URI)](js-apis-file-fileUri.md)
   - [@ohos.file.fs (File Management)](js-apis-file-fs.md)
   - [@ohos.file.hash (File Hash Processing)](js-apis-file-hash.md)
-  - [@ohos.file.picker (Picker)](js-apis-file-picker.md)
+  - [@ohos.file.picker (File Picker)](js-apis-file-picker.md)
   - [@ohos.file.securityLabel (Data Label)](js-apis-file-securityLabel.md)
   - [@ohos.file.statvfs (File System Space Statistics)](js-apis-file-statvfs.md)
   - [@ohos.file.storageStatistics (Application Storage Statistics)](js-apis-file-storage-statistics.md)

en/application-dev/reference/apis/js-apis-file-picker.md

-# @ohos.file.picker (Picker)
+# @ohos.file.picker (File Picker)
 
 > **NOTE**
 >
 > The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 
-**Picker** encapsulates system applications, such as **PhotoViewPicker**, **DocumentViewPicker**, and **AudioViewPicker**, and provides capabilities of selecting and saving images, videos, documents, and audio clips. The application can select the picker as required.
+The File Picker encapsulates system applications, such as **PhotoViewPicker**, **DocumentViewPicker**, and **AudioViewPicker**, and provides capabilities of selecting and saving photos, documents, and audio clips. The application can select the picker as required.
 
 ## Modules to Import
 ```js
@@ -378,7 +378,7 @@ Saves one or more documents in a **documentPicker** page. This API uses a promis
 
 | Type                           | Description   |
 | ----------------------------- | :---- |
-| Promise<Array<string>>  | Promise used to return the URIs of the documents saved.|
+| Promise<Array<string>> | Promise used to return the URIs of the documents saved.|
 
 **Example**