Summary:
Ref T7667. On the road to locking the auth config, also clean up some minor UI issues:
* Only show the warning about not Phacility instance auth if the user isn't a manager (see next diff).
* When rendering more than one warning in the guidance, add bullets.
* I didn't like the text in the `auth.config-lock` config setting.
Test Plan: Loaded the page, saw more reasonable-looking guidance: {F6369405}
Reviewers: epriestley
Reviewed By: epriestley
Subscribers: Korvin
Maniphest Tasks: T7667
Differential Revision: https://secure.phabricator.com/D20400
0583f6dc50