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: Ib0daab5ec202adfa15e66996f7e0b56a9ee0acdb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>