Update docs/multi-skill-assistants.rst
Update docs/multi-skill-assistants.rst

Co-Authored-By: Tom Metcalfe <4a447601c2cd1fbeb7b7723517c12b1bb0b66e66@rasa.com>
RasaHQ/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu