GitLab

Update nearby_contact_visibility visibility explanation strings.

Screenshots:
https://screenshot.googleplex.com/7Htyi2qu6qqvtkp.png
https://screenshot.googleplex.com/BgxPKkMQ4tFywjt.png
https://screenshot.googleplex.com/7sboMbzfBXK5Wc3.png

Fixed: 1157633
Change-Id: I9ed1a85f24b35823d3e7487d2923bc4801f2ab5b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586770
Commit-Queue: Gordon Seto <gordonseto@google.com>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#836335}