fix get media library switch API.

Signed-off-by: Ndy_study <dingyao5@huawei.com>
Change-Id: I58d7f46ecdbd8466cfeb3a690405455f4f292511

zh-cn/application-dev/application-models/medialibrary-switch.md

@@ -3,4 +3,4 @@
 
   | FA模型接口 | Stage模型接口对应d.ts文件 | Stage模型对应接口 | 
 | -------- | -------- | -------- |
-| [getMediaLibrary(): MediaLibrary;](../reference/apis/js-apis-medialibrary.md#medialibrarygetmedialibrary) | \@ohos.multimedia.mediaLibrary.d.ts | [getMediaLibrary(context: Context): MediaLibrary;](../reference/apis/js-apis-medialibrary.md#medialibrarygetmedialibrary8) |
+| [getMediaLibrary(): MediaLibrary;](../reference/apis/js-apis-medialibrary.md#medialibrarygetmedialibrary) | \@ohos.file.photoAccessHelper.d.ts | [getPhotoAccessHelper(context: Context): PhotoAccessHelper;](../reference/apis/js-apis-photoAccessHelper.md#photoaccesshelpergetphotoaccesshelper) |