Fix python docstring highlighter
Fix python docstring highlighter

Escaped ' or " at the end of a docstring no longer break highlighting.

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