Update Flow Creation Terminology
Update Flow Creation Terminology

Updates terminology from 'text messaging' to 'messaging' to gel with new channel types and clarifies Flow.Survey creates a Surveyor flow.
pulilab/rapidpro,pulilab/rapidpro,pulilab/rapidpro,ewheeler/rapidpro,ewheeler/rapidpro,tsotetsi/textily-web,ewheeler/rapidpro,tsotetsi/textily-web,ewheeler/rapidpro,pulilab/rapidpro,tsotetsi/textily-web,tsotetsi/textily-web,tsotetsi/textily-web,pulilab/rapidpro