Merge "Update doc for audio-coupled-haptic related stuff." am: fe752fc2 am: 1fe0a419

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2142192



Change-Id: I2e331381369021358a6530695b81c22453dd1226
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>