Camera: Improve docs for session parameters am: 622e3bd686

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

Change-Id: I9a09b6cab1bb2fb1a3bf67e959636ee8e525eec9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>