Add doc for NetworkScore#getLegacyInt

Test: comment-only change
Fixes: 184786246
Merged-In: I3c2563d4ae4e3715d0c6270344ba8f7ef067872f
Merged-In: I8306f01f3d247986683e272074047e3ad190f68e
Change-Id: I8306f01f3d247986683e272074047e3ad190f68e
  (cherry-picked from ag/14125152)
1 file changed