Protocol registry: edited the group for seucrity review (#258)

added SING

Author: simoneonofri

index.html

@@ -659,7 +659,7 @@ <h3>
         </aside>
       </li>
       <li>MUST have undergone security review by the <a href=
-      "https://www.w3.org/groups/wg/fedid/">Federated Identity Working
+      "https://www.w3.org/groups/ig/security/">Security Interest
       Group</a>.
       </li>
       <li>MUST have implementation commitment from at least one browser engine,