Fix dangling reference to html as context.

Author: gkellogg

index.html

@@ -10849,10 +10849,7 @@ <h3>Graph Containers</h3>
     <a data-cite="HTML/scripting.html#the-script-element">script element</a> in an HTML document containing a frame.
     The first <a data-cite="HTML/scripting.html#the-script-element">script element</a>
     of type <code>application/ld+json;profile=http://www.w3.org/ns/json-ld#frame</code>
-    will be used to find a <a>frame</a>.
-    This is similar to the mechanism described for retrieving contexts
-    from HTML documents as described in
-    <a href="#using-an-html-document-as-a-context" class="sectionRef"></a>.</p>
+    will be used to find a <a>frame</a>..</p>
 </section>
 </section>