Add documentation for avatar services settings.

Review Request #9350 — Created Nov. 6, 2017 and submitted — Latest diff uploaded

Information

Review Board
release-3.0.x
d6e3288...

Reviewers

This change adds docs for the new avatar services page in the admin UI.
This page is pretty simple, so the docs are nice and short.

  • Built HTML, checked output.
  • Spellcheck.