Update versions/3.0.4.md

Author: ralfhandl

versions/3.0.4.md

@@ -1861,7 +1861,7 @@ However, documentation is expected to cover a successful operation response and
 The `default` MAY be used as a default response object for all HTTP codes 
 that are not covered individually by the Responses Object.
 
-The `Responses Object` MUST contain at least one response code, and if only one
+The Responses Object MUST contain at least one response code, and if only one
 response code is provided it SHOULD be the response for a successful operation
 call.