Update hisplayer-api.md

Author: ivder

hisplayer-api.md

@@ -53,7 +53,6 @@ The following public APIs are provided by **HISPlayerManager**
     * **HISPLAYER_EVENT_TEXT_RENDER**
     * **HISPLAYER_EVENT_AUTO_TRANSITION**
     * **HISPLAYER_EVENT_PLAYBACK_BUFFERING**
-    * **HISPLAYER_EVENT_NETWORK_CONNECTED**
     * **HISPLAYER_EVENT_END_OF_CONTENT**
 
 * **public enum HISPlayerError**: The list of errors provided by HISPlayer SDK. The errors can be used with the virtual functions in the next section: