Better wording for Accept usage.

Author: handrews

jsonschema-core.xml

@@ -2946,10 +2946,12 @@ Accept: application/json;
                 </t>
 
                 <t>
-                    The Accept header also allows repeating the same media type with
-                    different parameters, which requests that the instance conforms
-                    to one parameter value or the other.  Such an instance can conform
-                    to all separately specified parameters but is not guaranteed to do so.
+                    Unlike Content-Type, Accept can contain multiple values to
+                    indicate that the client can accept several media types.
+                    In the above example, note that the two media types differ
+                    only by their schema parameter values.  This requests an
+                    application/json representation that conforms to at least one
+                    of the identified schemas.
                 </t>
 
                 <t>