Merge "Add details to VibrationEffect waveform documentation" into rvc-dev am: 19dd14d7 am: 76b6eb1e

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

Change-Id: I3fa0f2ad8324e8a78fa44c02ab5f563499c55097