fix minor HTML4 validation issue via update of Anolis

Author: annevk

cssom/Overview.html

@@ -3295,7 +3295,7 @@ <h3 class="no-num" id="normative-references">Normative references</h3>
 </dl></div>
 
 <h3 class="no-num" id="informative-references">Informative references</h3>
-<div id="anolis-references-informative"><dl></dl></div>
+<div id="anolis-references-informative"></div>
 
 
   <h2 class="no-num" id="acknowledgments">Acknowledgments</h2>