Replace some Phabricator references in PhabricatorStartup.php on comments and errors

Summary: There are still some Phabricator references in phorge\support\startup\PhabricatorStartup.php in both comments and warning/error messages.

Test Plan: No test plan as this is nothing more than changing in-line comments (zero impact) and some warning and error messages.

Reviewers: O1 Blessed Committers, avivey

Reviewed By: O1 Blessed Committers, avivey

Subscribers: tobiaswiese, valerio.bozzolan, Matthew

Maniphest Tasks: T15006

Differential Revision: https://we.phorge.it/D25857