Fix a leftover misspelled "Phabricator" reference

Summary: Closes T15850

Test Plan: Read the code and see that there isn't a typo anymore

Reviewers: O1 Blessed Committers, avivey

Reviewed By: O1 Blessed Committers, avivey

Subscribers: avivey, tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15850

Differential Revision: https://we.phorge.it/D25682