[css-color-6] Point to correct color-layers WPT files

Author: nt1m

css-color-6/Overview.bs

@@ -352,8 +352,8 @@ Layering Multiple Colors: the ''color-layers()'' function {#color-layers}
 
 	<wpt>
 	  	color-layers-no-blend-mode.html
-		parsing/color-layers-invalid.html
-		parsing/color-layers-valid.html
+		parsing/color-invalid-color-layers-function.html
+		parsing/color-valid-color-layers-function.html
 	</wpt>
 
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