Merge duplicate RTSP sections in dev-v2 release notes

PiperOrigin-RevId: 385139398

RELEASENOTES.md

@@ -158,6 +158,8 @@
     *   Fix session description (SDP) parsing to use a HashMap-like behaviour
         for duplicated attributes.
         ([#9014](https://github.com/google/ExoPlayer/issues/9014)).
+    *   Allow using absolute URI in the control attribute in a media description
+        ([#9183](https://github.com/google/ExoPlayer/issues/9183)).
 *   Metadata:
     *   Fix handling of emsg messages with an unset duration
         ([#9123](https://github.com/google/ExoPlayer/issues/9123)).
@@ -167,9 +169,6 @@
 *   Cronet extension:
     *   Add `CronetDataSource.Factory.setRequestPriority` to allow setting the
         priority of requests made by `CronetDataSource` instances.
-*   RTSP:
-    *   Allow using absolute URI in the control attribute in a media description
-        ([#9183](https://github.com/google/ExoPlayer/issues/9183)).
 
 ### 2.14.1 (2021-06-11)