[automerger skipped] Merge "Add some warnings and notes about framework's...

[automerger skipped] Merge "Add some warnings and notes about framework's jarjar rules" am: a4afdf09 am: fddc6660 -s ours am: 5c6f46a0 -s ours

am skip reason: Merged-In I09766423782d9bb9408f3d14169d7e5d8f1b5823 with SHA-1 524bf249 is already in history

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1719590

Change-Id: I44ccb20eb230c7eb57e29d706646acc7f7b3157b