rARC737bd0d42428

Update Diviner documentation to reference Phorge instead of Phabricator for Arcanist.

Test Plan: Generated Diviner documentation on a local install and verified that the changes look good.

Reviewers: O1 Blessed Committers, deadalnix

Reviewed By: O1 Blessed Committers, deadalnix

Subscribers: speck, tobiaswiese

Maniphest Tasks: T15012

Differential Revision: https://we.phorge.it/D25008