!13359 adapt to some changes

Merge pull request !13359 from onexiaomin/master

zh-cn/application-dev/reference/apis/js-apis-fileExtensionInfo.md

@@ -10,7 +10,7 @@
 ## 导入模块
 
 ```js
-import fileExtensionInfo from '@ohos.fileExtensionInfo';
+import fileExtensionInfo from '@ohos.file.fileExtensionInfo';
 ```
 
 ## fileExtensionInfo.DeviceType