Merge "Improve documentation for KeyguardManager" into main am: 9da4fbd52e am: 0cac37bd55 am: 024df6a27e am: 334c388862 am: 2c3499610f

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2747678

Change-Id: I9226ed1aa63a11068e94c4ce6a3b8dde4a94484a
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>