Updates developer docs for quick affordances. am: 1f6d4e0e1b am: 4988cc6168

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

Change-Id: If5ecf78f78e1351d1940262e2c82eb9c2f71746e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>