[css-color-4] Remove trailing mention of <absolute-color-function>, reword.

Author: svgeesus

css-color-4/Overview.bs

@@ -968,8 +968,8 @@ Representing Colors: the <<color>> type</h2>
 <h4 id="color-syntax-modern">
 Modern (Space-separated) Color Function Syntax</h4>
 
-	All of the <<absolute-color-function>> syntactic forms
-	defined in this specification
+	All of the <<absolute-color>> functional forms
+	first defined in this specification
 	use the <dfn export>modern color syntax</dfn>,
 	meaning: