Merge "Improve the API doc for setVcnUnderlyingNetworkPriorities" am: b85c5d7634 am: e6286ba332 am: 59bb050977

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1945490

Change-Id: I38301bd886ab0733bc66d5fd36f7c6368acf0fa5