Documentation: fix unexisting path sshd_config.phabricator.example
Since the example file was renamed, this change makes the documentation consistent with it.
Also we added exactly one-space somewhere, to create a super-satisfying indentation an example block. You're welcome.
Test Plan: Check that the documentation is at least 0.000001% better now.
Reviewers: O1 Blessed Committers, avivey
Reviewed By: O1 Blessed Committers, avivey
Subscribers: tobiaswiese, Matthew, Cigaryno
Maniphest Tasks: T15006
Differential Revision: https://we.phorge.it/D25410