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: I6fb33eaa0cb8768c0a9fa123ee3c951d68456cdf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>