Updates developer docs for quick affordances. am: 1f6d4e0e1b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/20526057

Change-Id: Ib43b851f8b790600a663a3f35fea0ee4b22783ed
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>