correctly queue a job, do not immediately execute!

howto/retire-a-host.md

@@ -31,7 +31,7 @@ provided you follow the warnings.
     * On Ganeti hosts, remove the actual instance with a delay, from
       the Ganeti master:
 
-          gnt-instance remove $host | at now + 7 days
+          echo "gnt-instance remove $host" | at now + 7 days
 
     * for a normal machine or a machine we do not own the parent host
       for, wipe the disks using the method described below