Fix typo.

playbooks/roles/edxapp/templates/workers.conf.j2

@@ -11,7 +11,7 @@ command={{ edxapp_venv_dir + '/bin/newrelic-admin run-program ' if w.monitor and
 killasgroup=true
 stopasgroup=true
 stopwaitsecs=432000
-stogsignal=INT
+stopsignal=INT
 
 {% endfor %}