Camera: document multiResolution raw behavior am: 48e33c5c8b

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/media/+/21549061

Change-Id: I41830a624058d1c32263f0e23f29bac875145a3a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>