Remove most of the customisation documentation, since StyledPlayerView
isn't really designed to be customised as deeply as PlayerView.
Also remove most documentation around StyledPlayerControlView,
especially as a standalone controller class - since it doesn't work
well for this use-case.
#minor-release
PiperOrigin-RevId: 426090762
These were missed in 9dae5fd2c0
These references will be re-written to PlayerView when exporting to
exoplayer2, so this commit results in some small reformatting changes.
Also fix a reference to LegacyPlayerControlView that should be
StyledPlayerControlView.
PiperOrigin-RevId: 420707706
