Merge "Updated the document regarding T data stack" into tm-dev am: 5a1a044e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/opt/telephony/+/18436120



Change-Id: I75e57b30956b10f977f66e5b5b1a8bb1640ce755
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>