Add release notes for issues fixed by preloading migration
Add release notes for issues fixed by preloading migration

PiperOrigin-RevId: 312080838

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