Doc: add linesection and trip modification
Doc: add linesection and trip modification

add integration documentation on line_section impact and on trip
modification

kinnou02/navitia,pbougue/navitia,xlqian/navitia,patochectp/navitia,xlqian/navitia,patochectp/navitia,kadhikari/navitia,pbougue/navitia,Tisseo/navitia,kinnou02/navitia,Tisseo/navitia,antoine-de/navitia,xlqian/navitia,kinnou02/navitia,xlqian/navitia,kadhikari/navitia,kinnou02/navitia,kadhikari/navitia,CanalTP/navitia,antoine-de/navitia,pbougue/navitia,kadhikari/navitia,CanalTP/navitia,xlqian/navitia,Tisseo/navitia,patochectp/navitia,antoine-de/navitia,antoine-de/navitia,Tisseo/navitia,CanalTP/navitia,Tisseo/navitia,pbougue/navitia,CanalTP/navitia,patochectp/navitia,CanalTP/navitia