fix up bikeshed syntax

Author: svgeesus

css-color-4/Overview.bs

@@ -258,10 +258,10 @@ Representing Colors: the <<color>> type</h2>
 	          <<system-color>>
 	</pre>
 
-	The <dfn export>color-functions</dfn> are <<rgb()>>, <<rgba()>>,
-		<<hsl()>>, <<hsla()>>, <<hwb()>>,
-		<<lab()>>, <<lch()>>,
-		<<color()>>, and <<device-cmyk()>>.
+	The <dfn export>color-functions</dfn> are <rgb()>, <rgba()>,
+		<hsl()>, <hsla()>, <hwb()>,
+		<lab()>, <lch()>,
+		<color()>, and <device-cmyk()>.
 
 	For easy reference in other specifications,
 	<dfn export>opaque black</dfn> is defined as the color <nobr>''rgb(0 0 0 / 100%)''</nobr>;