[css-fonts-4] Use css 5 absolute color definition for override-colors w3c#7010

Author: svgeesus

css-fonts-4/Overview.bs

@@ -25,7 +25,8 @@ WPT Display: closed
 
 <pre class="link-defaults">
 spec:css-color-4; type:property; text:color
-spec: css-color-4; type: type; text: <color>
+spec: css-color-5; type: type; text: <color>
+spec: css-color-5; type: type; text:absolute color
 spec:css-values; type:value; text:ex
 spec:css22; type:value; for:/; text:block
 spec:html; type:element; text:font
@@ -7742,14 +7743,17 @@ Overriding a colors from a palette: The 'override-colors!!descriptor' descriptor
 
 	<pre class='descdef'>
 	Name: override-colors
-	Value: [ <<integer [0, ∞]>> <<absolute-color-base>> ]#
+	Value: [ <<integer [0, ∞]>> <<color>> ]#
 	For: @font-palette-values
 	Initial: N/A
 	</pre>
 
 	This descriptor overrides colors
 	to the initial color palette represented by this ''@font-palette-values'' rule.
 
+	The specified <<color>> must be an
+	[=absolute color=].
+
 	The '@font-palette-values/override-colors' descriptor takes
 	a comma-separated list of palette index entries and colors.
 	Each item in the comma-separated list represents a tuple of