Merge "Improve the API doc for setVcnUnderlyingNetworkPriorities" am: b85c5d7634 am: e6286ba332 am: 59bb050977 am: 2580f4afc2

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

Change-Id: I567de4b56f6b92a1f0f28ca2da23924f84571db8