Camera: Improve docs for session parameters am: 622e3bd6 am: 46248c99 am:...

Camera: Improve docs for session parameters am: 622e3bd6 am: 46248c99 am: 33252d00 am: 6f25747c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/av/+/24621696



Change-Id: If9d7d0e1b9d9dd3d20fe297465b9eb6f5c7374a2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>