[python mode] Update docs to reflect new version default
[python mode] Update docs to reflect new version default

Closes #4201

namin/CodeMirror,alur/CodeMirror,TDaglis/CodeMirror,hackmdio/CodeMirror,adobe/CodeMirror2,adobe/CodeMirror2,nightwing/CodeMirror,xeronith/CodeMirror,jayaprabhakar/CodeMirror,SidPresse/CodeMirror,ficristo/CodeMirror,notepadqq/CodeMirror,mtaran-google/CodeMirror,INTELOGIE/CodeMirror,sourcelair/CodeMirror,hackmdio/CodeMirror,kerabromsmu/CodeMirror,dperetti/CodeMirror,kerabromsmu/CodeMirror,schanzer/CodeMirror,crazy4chrissi/CodeMirror,pabloferz/CodeMirror,jkaplon/CodeMirror,xeronith/CodeMirror,ejgallego/CodeMirror,rrandom/CodeMirror,xeronith/CodeMirror,crazy4chrissi/CodeMirror,grzegorzmazur/CodeMirror,nightwing/CodeMirror,INTELOGIE/CodeMirror,dperetti/CodeMirror,thomasjm/CodeMirror,ficristo/CodeMirror,jkaplon/CodeMirror,hackmdio/CodeMirror,alur/CodeMirror,thomasjm/CodeMirror,wingify/CodeMirror,ejgallego/CodeMirror,mtaran-google/CodeMirror,wingify/CodeMirror,rrandom/CodeMirror,codio/CodeMirror,nightwing/CodeMirror,notepadqq/CodeMirror,grzegorzmazur/CodeMirror,pabloferz/CodeMirror,SidPresse/CodeMirror,notepadqq/CodeMirror,TDaglis/CodeMirror,schanzer/CodeMirror,grzegorzmazur/CodeMirror,crazy4chrissi/CodeMirror,sourcelair/CodeMirror,adobe/CodeMirror2,ejgallego/CodeMirror,namin/CodeMirror,INTELOGIE/CodeMirror,wingify/CodeMirror,thomasjm/CodeMirror,jayaprabhakar/CodeMirror,TDaglis/CodeMirror,dperetti/CodeMirror,mtaran-google/CodeMirror,jkaplon/CodeMirror,alur/CodeMirror,MarcelGerber/CodeMirror,codio/CodeMirror,MarcelGerber/CodeMirror,ficristo/CodeMirror,schanzer/CodeMirror,namin/CodeMirror,jayaprabhakar/CodeMirror,MarcelGerber/CodeMirror,rrandom/CodeMirror,codio/CodeMirror,sourcelair/CodeMirror,pabloferz/CodeMirror,kerabromsmu/CodeMirror,SidPresse/CodeMirror