Merge "Document whether dist API files include updatable or not" into main am: 996abf256e

Original change: https://android-review.googlesource.com/c/platform/development/+/3072622

Change-Id: Ic1a13e87e1ecce84768bcd04861743c252e80350
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>