Update release notes for 1.9.2 and add missing link

PiperOrigin-RevId: 865864800
(cherry picked from commit cbbfd0f)

Author: tonihei

RELEASENOTES.md

@@ -11,6 +11,10 @@ This release includes the following changes since
     *   Fix bug where `ProgressiveMediaSource` propagates out-of-date timeline
         info to player and the queued periods unexpectedly get removed
         ([#3016](https://github.com/androidx/media/issues/3016)).
+*   Audio:
+    *   Improve the retry logic of `AudioOutput` initialization in
+        `DefaultAudioSink`
+        ([#2905](https://github.com/androidx/media/issues/2905)).
 *   Session:
     *   Fix issue where system UI button placement workaround negatively affects
         other UI surface like Android Auto or manufacturers not needing the