Merge "Add FAQ about header ABI checker" into main am: 7e2c49eff3 am: fe49b03343

Original change: https://android-review.googlesource.com/c/platform/development/+/2909188

Change-Id: Ib057dd899e0cdc239953d4b34aaabf5b52f40b5c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>