[css-2018] Markup fix

Author: frivoal

css-2018/Overview.bs

@@ -329,8 +329,6 @@ Background: The W3C Process and CSS</h3>
 				and adding the ability to specify text emphasis marks
 				and text shadows.
 
-			</dl>
-
 			<dt><a href="https://www.w3.org/TR/css3-speech/">CSS Speech Module Level 1</a>
 			  [[CSS3-SPEECH]]
 			<dd>