Print the configured GitLab user on the Admin-Sidekiq page

app/views/admin/background_jobs/show.html.haml

@@ -35,4 +35,4 @@
             %td= data.join(" ")
   %b If '[25 of 25 busy]' is shown, restart GitLab.
   %br
-  %b If more than one sidekiq process is listed, stop GitLab, kill the remaining sidekiq processes (sudo pkill -u git -f sidekiq) and restart GitLab.
+  %b If more than one sidekiq process is listed, stop GitLab, kill the remaining sidekiq processes (sudo pkill -u #{Settings.gitlab.user} -f sidekiq) and restart GitLab.