Merge "Camera: Improve documentation for 3A regions" into tm-dev am: 3a7a59da

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/17450690



Change-Id: I22db5063e418a2d61f14a3ed5b06db63c86806f8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>