Make clear that info/termsOfService should be an URL.
Make clear that info/termsOfService should be an URL.

As discussed in previous pull request #255, current tooling already
interprets it like that. This pull request just redoes the same change
to the 3.0 version instead of the 2.0 one (where they were not applied).

Original change by Matti Schneider <hi@mattischneider.fr>,  2015-01-29 10:51:26.

OAI/OpenAPI-Specification,OAI/OpenAPI-Specification,OAI/OpenAPI-Specification