Echo message needs update - install_mbot_ros_services.sh

[sxy-sun]

ros2_mbot_sys_utils/services/install_mbot_ros_services.sh

# Success message.
echo
echo "Installed, enabled, and started the following services:"
echo
for serv in $SERVICE_LIST
do
    echo "    $serv.service"
done
echo

Should be

# Success message.
echo
echo "Installed and enabled the following services:"
echo
for serv in $SERVICE_LIST
do
    echo "    $serv.service"
done
echo