Merge "docs: Updates to Multi-Window/PiP APIs for Preview 2" into mnc-mr-docs
am: bd7c1b4

* commit 'bd7c1b4df78237630f1172f4935868d43f114df1':
  docs: Updates to Multi-Window/PiP APIs for Preview 2

Change-Id: Id6860af1e6d06cf5eef3d23c8c89e5805583d45e