[documentation] fix plural
[documentation] fix plural

xlqian/navitia,CanalTP/navitia,xlqian/navitia,Tisseo/navitia,CanalTP/navitia,xlqian/navitia,CanalTP/navitia,Tisseo/navitia,Tisseo/navitia,xlqian/navitia,CanalTP/navitia,Tisseo/navitia,CanalTP/navitia,Tisseo/navitia,xlqian/navitia