Fix typo "this this server"

Summary: Closes T15611

Test Plan: Carefully read.

Reviewers: O1 Blessed Committers, avivey

Reviewed By: O1 Blessed Committers, avivey

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Maniphest Tasks: T15611

Differential Revision: https://we.phorge.it/D25404