Add release notes

RELEASENOTES.md

@@ -73,6 +73,8 @@
 *   RTSP:
 *   RTSP:
     *   Support RFC4566 SDP attribute field grammar
     *   Support RFC4566 SDP attribute field grammar
         ([#9430](https://github.com/google/ExoPlayer/issues/9430)).
         ([#9430](https://github.com/google/ExoPlayer/issues/9430)).
+    *	Provide a client API to override the `SocketFactory` used for any server
+	connection ([#9606](https://github.com/google/ExoPlayer/pull/9606)).
 *   DASH:
 *   DASH:
     *   Populate `Format.sampleMimeType`, `width` and `height` for image
     *   Populate `Format.sampleMimeType`, `width` and `height` for image
         `AdaptationSet` elements
         `AdaptationSet` elements