[automerger skipped] Add doc for NetworkScore#getLegacyInt am: 0422927cd8 am: fd5d21d50e -s ours am: 62e1a5928a -s ours
am skip reason: Merged-In I3c2563d4ae4e3715d0c6270344ba8f7ef067872f with SHA-1 2afd0986d3 is already in history
Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1727811
Change-Id: I7b69e075b55f59c47e112226f60ca69d59e4a4e8
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