Remove additional @set to containers.

Author: gkellogg

index.html

@@ -3384,12 +3384,10 @@ <h3>Algorithm</h3>
                 <li>If the value does not contain an <code>@id</code> <a>member</a>,
                   append the values <code>@graph@id</code> and <code>@graph@id@set</code>
                   to <var>containers</var>.</li>
-                <li>Append the values <code>@index</code>, <code>@index@set</code>,
-                  and <code>@set</code>
+                <li>Append the values <code>@index</code> and <code>@index@set</code>
                   to <var>containers</var>.</li>
                 <li>Set <var>type/language</var> to <code>@type</code>
                   and set <var>type/language value</var> to <code>@id</code>.</li>
-                <li>Append <code>@set</code> to <var>containers</var>.</li>
               </ol>
             </li>
             <li>Otherwise: