Merge "Clarify docs for status codes in VcnStatusCallback." am: 36a84ebbaf am: 2ea2b734e5 am: f73591b47f

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1660643

Change-Id: Ib276041e5f3c5e0401bf466939384bfaa8801119