Update entities.rst
Update entities.rst

Moved extractor and processor information to this page instead of in the training data page.
RasaHQ/rasa_nlu,beeva-fernandocerezal/rasa_nlu,RasaHQ/rasa_nlu,RasaHQ/rasa_nlu,verloop/rasa_nlu,PHLF/rasa_nlu,PHLF/rasa_nlu,verloop/rasa_nlu,beeva-fernandocerezal/rasa_nlu