Tweak media_type -> accepted_media_type. Need to document, but marginally less confusing

rest_framework/response.py

@@ -21,6 +21,14 @@ class Response(SimpleTemplateResponse):
         self.data = data
         self.headers = headers and headers[:] or []
         self.renderer = renderer
+
+        # Accepted media type is the portion of the request Accept header
+        # that the renderer satisfied.  It could be '*/*', or somthing like
+        # 'application/json; indent=4'
+        #
+        # This is NOT the value that will be returned in the 'Content-Type'
+        # header, but we do need to know the value in case there are
+        # any specific parameters which affect the rendering process.
         self.accepted_media_type = accepted_media_type
 
     @property