Explicitly reference MIMESNIFF.

Author: msporny

index.html

@@ -2027,7 +2027,7 @@ <h3>Verify Proof</h3>
         <dl>
           <dt>|mediaType|</dt>
           <dd>
-A [=MIME type|media type=]
+A [=MIME type|media type=] as defined in [[MIMESNIFF]]
           </dd>
           <dt>|documentBytes|</dt>
           <dd>