update docs against 7959

Signed-off-by: Nwusongqing <wusongqing@huawei.com>

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

@@ -2278,7 +2278,7 @@ Describes options for fetching media files.
 
 | Name                   | Type               | Readable| Writable| Mandatory| Description                                                        |
 | ----------------------- | ------------------- | ---- | ---- | ---- | ------------------------------------------------------------ |
-| selections              | string              | Yes  | Yes  | Yes  | Conditions for fetching files. The enumerated values in [FileKey](#filekey8) are used as the column names of the conditions. Example:<br>selections: mediaLibrary.FileKey.MEDIA_TYPE + '= ? OR' +mediaLibrary.FileKey.MEDIA_TYPE + '= ?',|
+| selections              | string              | Yes  | Yes  | Yes  | Conditions for fetching files. The enumerated values in [FileKey](#filekey8) are used as the column names of the conditions. Example:<br>selections: mediaLibrary.FileKey.MEDIA_TYPE + '= ? OR ' +mediaLibrary.FileKey.MEDIA_TYPE + '= ?', |
 | selectionArgs           | Array&lt;string&gt; | Yes  | Yes  | Yes  | Value of the condition, which corresponds to the value of the condition column in **selections**.<br>Example:<br>selectionArgs: [mediaLibrary.MediaType.IMAGE.toString(), mediaLibrary.MediaType.VIDEO.toString()], |
 | order                   | string              | Yes  | Yes  | No  | Sorting mode of the search results, which can be ascending or descending. The enumerated values in [FileKey](#filekey8) are used as the columns for sorting the search results. Example:<br>Ascending: order: mediaLibrary.FileKey.DATE_ADDED + " AESC"<br>Descending: order: mediaLibrary.FileKey.DATE_ADDED + " DESC"|
 | uri<sup>8+</sup>        | string              | Yes  | Yes  | No  | File URI.                                                     |