update docs

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

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

@@ -2,7 +2,7 @@
 >![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE:**
 >
 >- 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. Currently, it can be called only by **filepicker**.
+>- The APIs of this module are system APIs and cannot be called by third-party applications. Currently, these APIs can be called only by **filepicker**.
 ## Modules to Import
 
 ```js

en/application-dev/reference/apis/js-apis-storage-statistics.md

@@ -3,7 +3,7 @@
 > ![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.
-> - This is a system API and cannot be called by third-party applications.
+> - The APIs of this module are system APIs and cannot be called by third-party applications.
 
 ## Modules to Import