[css-lists-3][editorial] fix markup

Author: tabatkins

css-lists-3/Overview.bs

@@ -25,6 +25,7 @@ Abstract: This module contains CSS features related to list counters: styling th
 
 <pre class='link-defaults'>
 spec:css-pseudo-4; type:selector; text:::before
+spec:selectors-4; type:dfn; text:selector
 spec:infra; type:dfn;
 	text:list
 	text:string
@@ -1347,14 +1348,14 @@ Outputting Counters: the ''counter()'' and ''counters()'' functions</h3>
 
 	[=Counters=] have no visible effect by themselves,
 	but their values can be used
-	with the ''counter()'' and ''counters()'' functions,
+	with the <dfn>counter()</dfn> and <dfn>counters()</dfn> functions,
 	whose [=used values=] represent counter values as strings or images.
 	They are defined as follows:
 
 	<pre class="prod">
 		<dfn><<counter>></dfn> = <<counter()>> | <<counters()>>
-		<dfn>counter()</dfn>  =  counter( <<counter-name>>, <<counter-style>>? )
-		<dfn>counters()</dfn> = counters( <<counter-name>>, <<string>>, <<counter-style>>? )
+		<<counter()>>  =  counter( <<counter-name>>, <<counter-style>>? )
+		<<counters()>> = counters( <<counter-name>>, <<string>>, <<counter-style>>? )
 	</pre>
 
 	where <<counter-style>> specifies the [=counter style=]