add missing <dd> tag

Wes1262 · web-flow · commit 7c79e5bae088 · 2018-10-18T02:36:42.000+02:00
diff --git a/css-syntax-3/Overview.bs b/css-syntax-3/Overview.bs
@@ -2277,6 +2277,7 @@ Consume an at-rule</h4>
 			Return the at-rule.
 
 		<dt><<EOF-token>>
+		<dd>
 			This is a <a>parse error</a>.
 			Return the at-rule.
 
