Update release notes for #6776
Update release notes for #6776

PiperOrigin-RevId: 286586865

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