R1:0583f6dc50a8

Some formatting changes for showing auth provider config guidance

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…