Merge "Update the string of the migration tooltips." into sc-v2-dev am: 3f1a7a2a33 am: 59a0a3bad4

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16406935

Change-Id: I74f99e8a6a1545f941622916aca2ed5b3d77a0c8