Clean up release notes for 2.12: Move sections into a better order
Clean up release notes for 2.12: Move sections into a better order

PiperOrigin-RevId: 326221199

google/ExoPlayer,androidx/media,amzn/exoplayer-amazon-port,google/ExoPlayer,ened/ExoPlayer,amzn/exoplayer-amazon-port,ened/ExoPlayer,google/ExoPlayer,androidx/media,amzn/exoplayer-amazon-port,androidx/media,ened/ExoPlayer