Merge duplicate UI and Text release notes sections

PiperOrigin-RevId: 362079362

RELEASENOTES.md

@@ -5,6 +5,8 @@
 *   UI:
     *   Add builder for `PlayerNotificationManager`.
     *   Add group setting to `PlayerNotificationManager`.
+    *   Fix `StyledPlayerView` scrubber not reappearing correctly in some cases
+        ([#8646](https://github.com/google/ExoPlayer/issues/8646)).
 *   Audio:
     *   Report unexpected discontinuities in
         `AnalyticsListener.onAudioSinkError`
@@ -43,13 +45,9 @@
         video tracks (previously separate acquire and release events were
         dispatched for each track in each period).
     *   Include the session state in DRM session-acquired listener methods.
-*   UI
-    *   Fix `StyledPlayerView` scrubber not reappearing correctly in some cases
-        ([#8646](https://github.com/google/ExoPlayer/issues/8646)).
 *   Text
     *   Parse SSA/ASS bold & italic info in `Style:` lines
         ([#8435](https://github.com/google/ExoPlayer/issues/8435)).
-*   Text:
     *   Don't display subtitles after the end position of the current media
         period (if known). This ensures sideloaded subtitles respect the end
         point of `ClippingMediaPeriod` and prevents content subtitles from