[automerger skipped] trusty/apploader: Add missing doc for enum value am:...

[automerger skipped] trusty/apploader: Add missing doc for enum value am: 63818fc1 -s ours am: 39004cff -s ours

am skip reason: Merged-In Ia9b17f4ea705d13567b2ba74f2dcd6df5a0c7d73 with SHA-1 c5253819 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/system/core/+/19881149



Change-Id: I16c925bc51cae5d56c99aaad17d9210937f51328
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>