Camera: Improve docs for session parameters am: 622e3bd6 am: e9907fc8 am:...

Camera: Improve docs for session parameters am: 622e3bd6 am: e9907fc8 am: a91df04b am: c958cac8

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



Change-Id: Ied20ec5558aea72c034019d3589c2809b29b7f99
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>