Fix Foreward example (#355)

Author: thomasheritage

doc/main.html

@@ -458,7 +458,7 @@ <h5>RDD</h5>
 
           <div class="example">
 <pre>
-&lt;section id=&quot;element-proponent&quot;&gt;
+&lt;section id=&quot;sec-foreword&quot;&gt;
   &lt;p&gt;This is the additional information relevant to the document.&lt;/p&gt;
   &lt;dl id=&quot;rdd-proponent&quot;&gt;
     &lt;dt&gt;Company 1 Name Here&lt;/dt&gt;