Merge "Updating comments on cow layout" into main am: 1b52ac6efe

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2754949

Change-Id: I137135d6473e83c79dcdc9ed016ef8d61050cba0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>