Remove duplicate release notes
Remove duplicate release notes

These were accidentally introduced when rebasing
https://github.com/google/ExoPlayer/commit/6946170d3ece533655a23f8fe65936412f365a6c

PiperOrigin-RevId: 297602131

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