Add mnc and modify docs for emergencyDial

Test: Treehugger
Bug: 112657134
Change-Id: Ia731ed350184fc35663a7bee54144a3ee7febcbe
Merged-In: Ia731ed350184fc35663a7bee54144a3ee7febcbe
(cherry picked from commit ee5598dc2ece906a391883e7072ae5b917df0935)
2 files changed