[css-images-4] Fixed 0deg link

Author: LeaVerou

css-images-4/Overview.bs

@@ -621,7 +621,7 @@ Conic Gradients: the ''conic-gradient()'' notation</h3>
 		<dt><dfn><<angle>></dfn>
 		<dd>
 			The entire gradient is rotated by this angle.
-			If omitted, defaults to ''<angle>|0deg''.
+			If omitted, defaults to ''0deg''.
 
 		<dt><dfn><<position>></dfn>
 		<dd>