Fix links to ShareTargetParams member definitions.

Author: mgiuca

index.html

@@ -300,6 +300,9 @@ <h3>
           The <dfn>params</dfn> member contains a <a>ShareTargetParams</a>
           dictionary.
         </p>
+      </section>
+      <section data-dfn-for="ShareTargetParams" data-link-for=
+      "ShareTargetParams">
         <h3>
           <code>ShareTargetParams</code> and its members
         </h3>