docs/deployment: Fix systemctl commands

docs/deployment: Fix systemctl commands

systemctl takes the name of the operation before the name of the service
so that you can do multiple things at once, i.e. "systemctl status nginx
postgresql".  Fix the ordering of the arguments.

Signed-off-by: Russell Currey <ruscur@russell.cc>
Reviewed-by: Stephen Finucane <stephen.finucane@intel.com>