[css-color-4] notes can't be normative

Author: svgeesus

css-color-4/Overview.bs

@@ -918,7 +918,7 @@ and there shall be no thousands separator.
 		the serialization is not sufficient because the name and the link to the profile are also needed.
 	-->
 
-	Note: If the colorspace is sRGB, the colorspace is still explicitly required in the serialized result.
+	If the colorspace is sRGB, the colorspace is still explicitly required in the serialized result.
 
 	The precision with which ''color()'' component values are retained,
 	and thus the number of significant figures in the serialized value,