Doc: remove notice about xml-rpc. useless
Doc: remove notice about xml-rpc. useless

closes #544

laurentj/lizmap-web-client,laurentj/lizmap-web-client,nboisteault/lizmap-web-client,3liz/lizmap-web-client,laurentj/lizmap-web-client,3liz/lizmap-web-client,3liz/lizmap-web-client,rldhont/lizmap-web-client,rldhont/lizmap-web-client,nboisteault/lizmap-web-client,nboisteault/lizmap-web-client,rldhont/lizmap-web-client,rldhont/lizmap-web-client,3liz/lizmap-web-client,nboisteault/lizmap-web-client,laurentj/lizmap-web-client