Clarify the Weaver documentation am: a4742a0291 am: cf07ed821d am: 6ee7a1e6bc am: 4e9c686f5e

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

Change-Id: I69d5f3f5ae1b1b228b1fc31789e3d8f41d0a37ed
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>