Clarify the Weaver documentation am: a4742a0291 am: cf07ed821d am: 6ee7a1e6bc

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

Change-Id: Ia0447b51e346c898dce0fd41762285f0ff2b784b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>