Merge "Update docs for MediaProjectionManager.getMediaProjection" into rvc-dev am: 322b748b am: 12e0ba73 am: b17c5e78

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11683095

Change-Id: Ied7309ff0cf634ffc575b62180cd634233550512