Docs: Repair Omnibus Unicorn settings link

doc/administration/operations/unicorn.md

@@ -51,7 +51,7 @@ master process has PID 56227 below.
 The main tunable options for Unicorn are the number of worker processes and the
 request timeout after which the Unicorn master terminates a worker process.
 See the [Omnibus GitLab Unicorn settings
-documentation](https://gitlab.com/gitlab-org/omnibus-gitlab/blob/master/doc/settings/unicorn.html)
+documentation](https://docs.gitlab.com/omnibus/settings/unicorn.html)
 if you want to adjust these settings.
 
 ## unicorn-worker-killer