Add small documentation details
Add some small Diviner documentation details like:
- mention PHP 8.1 (thanks https://we.phorge.it/Q18)
- mention the fact that you need multiple databases (it may be not obvious from the startup)
- mention MariaDB and not just MySQL (thanks MariaDB community!)
- mention "Administrator" and not just "User" for the "Instructions for installing, configuring, and using Phorge."
I was not bold enough to do more changes.
Test Plan: I tested locally and Diviner does not look bad.
Reviewers: O1 Blessed Committers, avivey
Reviewed By: O1 Blessed Committers, avivey
Subscribers: avivey, speck, tobiaswiese, Matthew, Cigaryno
Differential Revision: https://we.phorge.it/D25064