Merge "Better help message for letterbox rounded corners" into 24D1-dev am: dab290ec08

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/26939878

Change-Id: I9eb8217bfcfbc34cd950b43a972ca65d19f63719
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>