[css-color-4] lets actually export that definition of color, duh

Author: svgeesus

css-color-4/Overview.bs

@@ -252,7 +252,7 @@ Representing Colors: the <<color>> type</h2>
 	indicating how transparent it is,
 	and thus how much of the backdrop one can see behind the color.
 
-	Colors in CSS are represented by the <dfn><<color>></dfn> type:
+	Colors in CSS are represented by the <dfn export><<color>></dfn> type:
 
 	<pre class='prod'>
 	&lt;color> = <<hex-color>> | <<named-color>> | currentcolor | transparent