[css-color-4] remove catch-22 for fallback

Author: svgeesus

css-color-4/Overview.bs

@@ -3962,8 +3962,10 @@ Specifying a color profile: the ''@color-profile'' at-rule</h3>
 
 	The <<dashed-ident>> gives the <a>color profile's</a> name,
 	by which it will be used in a CSS stylesheet.
-	Alternatively, the ''device-cmyk'' keyword means that this color profile
-	will be used to resolve colors specified in ''device-cmyk''.
+	Alternatively, the ''device-cmyk'' keyword
+	means that this color profile will,
+	if valid,
+	be used to resolve colors specified in ''device-cmyk''.
 	<!-- All of the predefined color space keywords
 	(''srgb'', ''display-p3'', ''a98-rgb'', ''prophoto-rgb'', ''rec2020'')
 	are excluded from this <<custom-ident>>,