Merge "Update Java doc for FLAG_ACTIVITY_LAUNCH_ADJACENT" into rvc-dev am: 8411d73710 am: a4c19e96b8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11905502

Change-Id: Icda48a3a220248330c3ceed7effb5770bae6b2a7