Merge "Add some updates to documentation regarding concurrent camera operation." into rvc-dev am: 416e3d94f9 am: 0bd046e46d

Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/11832204

Change-Id: I64a9dfda35b57d373680c2c06fc4d69ed59e6ebf