Update tethering notification strings

Update strings after converged with carrier.

Bug: 145629001
Bug: 147818698
Test: atests TetheringTests
Change-Id: I8ad34e8c93ba1547aa397a8e9c0ecc15286a2b0b
Merged-In: I8ad34e8c93ba1547aa397a8e9c0ecc15286a2b0b
(cherry picked from commit d4a1bd7b73991c4197b49a3ff36e7683273ae736, aosp/1284584)
4 files changed