Grammar fix (#6933)

Author: Bart

docs/tutorial/2-requests-and-responses.md

@@ -29,7 +29,7 @@ REST framework provides two wrappers you can use to write API views.
 
 These wrappers provide a few bits of functionality such as making sure you receive `Request` instances in your view, and adding context to `Response` objects so that content negotiation can be performed.
 
-The wrappers also provide behaviour such as returning `405 Method Not Allowed` responses when appropriate, and handling any `ParseError` exception that occurs when accessing `request.data` with malformed input.
+The wrappers also provide behaviour such as returning `405 Method Not Allowed` responses when appropriate, and handling any `ParseError` exceptions that occur when accessing `request.data` with malformed input.
 
 ## Pulling it all together