[css-fonts-4][editorial] use correct exported term, fix #7010

Author: svgeesus

css-fonts-4/Overview.bs

@@ -6532,7 +6532,7 @@ Overriding a colors from a palette: The 'override-colors!!descriptor' descriptor
 
     <pre class='descdef'>
     Name: override-colors
-    Value: [ <<integer [0, ∞]>> <<absolute-color>> ]#
+    Value: [ <<integer [0, ∞]>> <<absolute-color-base>> ]#
     For: @font-palette-values
     Initial: N/A
     </pre>