updated docs

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

en/application-dev/media/Readme-EN.md

 # Media
 
-- Audio
-    - [Audio Overview](audio-overview.md)
-    - [Audio Playback Development](audio-playback.md) 
-    - [Audio Management Development](audio-management.md)  
-    - [Audio Recording Development](audio-recorder.md)
-    - [Audio Playback Development Using AudioRenderer](audio-renderer.md)  
-    - [Audio Recorder Development Using AudioCapturer](audio-capturer)  
-- Video
-  - [Video Playback Development](video-playback.md)
+-   Audio
+    -   [Audio Overview](audio-overview.md)
+    -   [Audio Playback Development](audio-playback.md) 
+
+    -   [Audio Management Development](audio-management.md)  
+
+    -   [Audio Recording Development](audio-recorder.md) 
+
\ No newline at end of file