doc.kak: Fix anchor name completion
doc.kak: Fix anchor name completion

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