docs: add missing <a-{> <a-}> <a-[> and <a-]> keys
docs: add missing <a-{> <a-}> <a-[> and <a-]> keys

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