[css-color-4] add note on ICC profile MIME type

Author: svgeesus

css-color-4/Overview.bs

@@ -2895,6 +2895,10 @@ Specifying a color profile: the ''@color-profile'' at-rule</h3>
 
 	The '@color-profile/src' descriptor specifies the URL to retrieve the color-profile information from.
 
+	Note: The Internet Media Type ("MIME type")
+	for ICC profiles is
+	<a href="https://www.iana.org/assignments/media-types/application/vnd.iccprofile">application/vnd.iccprofile</a>.
+
 	<!-- should we add a format field to this descriptor, like with font-face src? it is always ICC format
 	in practice, but that could change in the future. or we could add format later, once there is
 	a need, and make the default ICC if not specified -->