update js-apis-environment.md

Signed-off-by: Nester.zhou <ester.zhou@huawei.com>

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

 # Environment
 
+This module provides JS APIs for obtaining the root directories of the storage and public files.
+
 > **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.
 > - The APIs of this module are system APIs and cannot be called by third-party applications.
 
-This module provides JS APIs for obtaining the root directories of the storage and public files.
-
 ## Modules to Import
 
 ```js