Fixed reference

index.html

@@ -443,7 +443,7 @@ <h2>Media Type and File Extension</h2>
 
       <dd>
         <p>As the application manifest format is JSON and will commonly be
-        encoded using [[!!Unicode]], the security considerations described in
+        encoded using [[!!UNICODE]], the security considerations described in
         [[!JSON]] and [[!UTR36]] apply. In addition, implementers need to
         impose their own implementation-specific limits on the values of
         otherwise unconstrained member types, e.g. to prevent denial of service