Camera: document multiResolution raw behavior am: 3492f3cff9 am: d2d19effc6

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/21548905

Change-Id: Ieecf5a6664125934a83c13307104cc96f3e270c8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>