README: minor updates am: d7d4a5b144

Original change: https://android-review.googlesource.com/c/platform/tools/repohooks/+/3422261

Change-Id: I6c9ca97f0f566fc8761aa317bbda0f6d87c26431
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>