Clarify the Weaver documentation am: a4742a0291

Original change: https://android-review.googlesource.com/c/platform/hardware/interfaces/+/2665198

Change-Id: I241107ae39fe30112f46b33906a09a6824d31e69
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>