Merge "Update documentation for...

Merge "Update documentation for WindowManager.LayoutParams#preferredRefreshRate" into udc-dev am: 79b8e4c3

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/22122048



Change-Id: I3346a188c8f57c787bd48e3730863d25cd76f5a8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>