#1084 use `story` lexer in docs as `markdown` does not exist
#1084 use `story` lexer in docs as `markdown` does not exist

RasaHQ/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_core,RasaHQ/rasa_core,RasaHQ/rasa_nlu,RasaHQ/rasa_core