Merge "Improve doc for NetCaps and NetRequest, and add slice XML docs" am: 605fe2da17 am: c46258ccb6

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2428975

Change-Id: I5f0e26213ad75116a9cd04e4042b70963df3961d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>