[css-color-5] Defined that if there are multiple @color-profile rules,the last one wins w3c#12980

Author: svgeesus

css-color-5/Overview.bs

@@ -2025,6 +2025,9 @@ or any other color or monochrome output device which has been characterized.
 
 		The '@color-profile/src' descriptor specifies the URL to retrieve the color-profile information from.
 
+		If multiple ''@color-profile' rules are defined with the same name,
+		the last one in document order wins, and all preceding ones are ignored.
+
 		The retrieved ICC profile is valid if
 
 		- it can be parsed as an ICC Profile