Merge "Camera: Modify CameraCharacteristics documentation about static keys." into udc-dev am: 34a72fe6 am: 34e4ace4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22356286



Change-Id: I4e2a29ecfd2f2980159a5771590c62f868da14d8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>