[selectors] markup tweak

Author: tabatkins

selectors/Overview.bs

@@ -1569,21 +1569,21 @@ Substring matching attribute selectors</h3>
 	substrings in the value of an attribute:
 
 	<dl>
-		<dt>''[att^=val]''
+		<dt><css>[att^=val]</css>
 		<dd>
 			Represents an element with the <code>att</code> attribute
 			whose value begins with the prefix "val".
 			If "val" is the empty string
 			then the selector does not represent anything.
 
-		<dt>''[att$=val]''
+		<dt><css>[att$=val]</css>
 		<dd>
 			Represents an element with the <code>att</code> attribute
 			whose value ends with the suffix "val".
 			If "val" is the empty string
 			then the selector does not represent anything.
 
-		<dt>''[att*=val]''
+		<dt><css>[att*=val]</css>
 		<dd>
 			Represents an element with the <code>att</code> attribute
 			whose value contains at least one instance of the substring "val".

selectors/Overview.html

@@ -1805,21 +1805,21 @@ <h3 class="heading settled" data-level=6.2 id=attribute-substrings><span class=s
 	substrings in the value of an attribute:</p>
 
 	<dl>
-		<dt>''[att^=val]''
+		<dt><span class=css>[att^=val]</span>
 		<dd>
 			Represents an element with the <code>att</code> attribute
 			whose value begins with the prefix "val".
 			If "val" is the empty string
 			then the selector does not represent anything.
 
-		<dt>''[att$=val]''
+		<dt><span class=css>[att$=val]</span>
 		<dd>
 			Represents an element with the <code>att</code> attribute
 			whose value ends with the suffix "val".
 			If "val" is the empty string
 			then the selector does not represent anything.
 
-		<dt>''[att*=val]''
+		<dt><span class=css>[att*=val]</span>
 		<dd>
 			Represents an element with the <code>att</code> attribute
 			whose value contains at least one instance of the substring "val".