Add documentation for the set_cursor ui call in json_ui.asciidoc
Add documentation for the set_cursor ui call in json_ui.asciidoc

casimir/kakoune,jjthrash/kakoune,occivink/kakoune,mawww/kakoune,occivink/kakoune,mawww/kakoune,lenormf/kakoune,lenormf/kakoune,Somasis/kakoune,danr/kakoune,jjthrash/kakoune,casimir/kakoune,occivink/kakoune,mawww/kakoune,Somasis/kakoune,casimir/kakoune,jjthrash/kakoune,danr/kakoune,jkonecny12/kakoune,jkonecny12/kakoune,lenormf/kakoune,jkonecny12/kakoune,alexherbo2/kakoune,Somasis/kakoune,danr/kakoune,lenormf/kakoune,alexherbo2/kakoune,casimir/kakoune,Somasis/kakoune,alexherbo2/kakoune,mawww/kakoune,jkonecny12/kakoune,occivink/kakoune,alexherbo2/kakoune,jjthrash/kakoune,danr/kakoune