Update release notes for 2.11.2
Update release notes for 2.11.2

PiperOrigin-RevId: 292881432

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