Merge "Update learn more string of FooterPrefernce" into tm-dev am: 24654a3d am: 4d371adf

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Settings/+/18356903



Change-Id: I8687407c4c7c99015bc38818b9a1beb681a3e1df
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>