[css-syntax-3][editorial] Fix bikeshed errors

Author: kbabbitt

css-syntax-3/Overview.bs

@@ -1460,7 +1460,7 @@ Check if two code points are a valid escape</h4>
 
 
 <h4 id="would-start-an-identifier">
-Check if three code points would start an ident sequence</dfn></h4>
+Check if three code points would start an ident sequence</h4>
 
 	This section describes how to
 	<dfn oldids="check-if-three-code-points-would-start-an-identifier" lt="check if three code points would start an ident sequence|starts with an ident sequence|start with an ident sequence|would start an ident sequence">check if three code points would start an [=ident sequence=]</dfn>.
@@ -2852,7 +2852,7 @@ Consume a block's contents</h4>
 			If a [=rule=] was returned,
 			append it to |rules|.
 
-		<dt>anything else</dd>
+		<dt>anything else
 		<dd>
 			[=Mark=] |input|.