Merge "Improve documentation for KeyguardManager" into main am: 9da4fbd52e am: 0cac37bd55

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

Change-Id: I239626d4597ea3e82c7a8c25516bf54e86969cdf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>