Update release notes for GL classes changes

PiperOrigin-RevId: 273937090

RELEASENOTES.md

@@ -95,6 +95,8 @@
     and move it to the core library.
     and move it to the core library.
   * Move `LibvpxVideoRenderer.MSG_SET_OUTPUT_BUFFER_RENDERER` to
   * Move `LibvpxVideoRenderer.MSG_SET_OUTPUT_BUFFER_RENDERER` to
     `C.MSG_SET_OUTPUT_BUFFER_RENDERER`.
     `C.MSG_SET_OUTPUT_BUFFER_RENDERER`.
+  * Use `VideoDecoderRenderer` as an implementation of
+    `VideoDecoderOutputBufferRenderer`, instead of `VideoDecoderSurfaceView`.
 * Add `Timeline.Window.isLive` to indicate that a window is a live stream
 * Add `Timeline.Window.isLive` to indicate that a window is a live stream
   ([#2668](https://github.com/google/ExoPlayer/issues/2668) and
   ([#2668](https://github.com/google/ExoPlayer/issues/2668) and
   [#5973](https://github.com/google/ExoPlayer/issues/5973)).
   [#5973](https://github.com/google/ExoPlayer/issues/5973)).