Merge "Add details to VibrationEffect waveform documentation" into rvc-dev am: 19dd14d7 am: bdac8459 am: 8a478317 am: 943bc95c

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11837599

Change-Id: I00a52e8ed5a46e9e1220eeed717f7f504a87a2b6