Fix and clean up 2.11.0 release notes
Fix and clean up 2.11.0 release notes

PiperOrigin-RevId: 282227866

androidx/media,androidx/media,ened/ExoPlayer,ened/ExoPlayer,ened/ExoPlayer,stari4ek/ExoPlayer,amzn/exoplayer-amazon-port,google/ExoPlayer,google/ExoPlayer,androidx/media,google/ExoPlayer,stari4ek/ExoPlayer,amzn/exoplayer-amazon-port,amzn/exoplayer-amazon-port,stari4ek/ExoPlayer