rc troff: Highlight *ROFF files
rc troff: Highlight *ROFF files

Fixes #2508

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