formatSupport is a 2-dimensional int array but it's documented as
being indexed by 3 things. This seems to be a copy-paste mistake in
https://github.com/google/ExoPlayer/commit/e97b8347eb190f12191c5b97d1c086326387f9bb
selectAllTracks() takes a 3-dimensional array with the same
3-indexed documentation, which makes sense there.
Also rename formatSupports -> formatSupport for consistency.
PiperOrigin-RevId: 325779435
