Merge "Adds illustration to Flash Notifications settings page" into udc-dev am: 6dfcad2cb2

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/22164175

Change-Id: Ic88a092c01d1f0441615287485d5e0f4aef85c68
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>