Maximize compatibility string update

- Single AP device:
  Title: Extend compatibility
  Summary: Helps other devices find this hotspot. Reduces hotspot connection speed.

- Dual AP device:
  Title: Extend compatibility
  Summary: Helps other devices find this hotspot. Increases battery usage.

- Screenshot:
  https://screenshot.googleplex.com/84sFvsDegjvJfWT

Bug: 184595717
Test: manual test
atest -c WifiTetherMaximizeCompatibilityPreferenceControllerTest

Change-Id: Idca20d4cf5b174110f800fbed91c404d13994b94