[css-fonts] [palettes] CSSFontPaletteValuesRule's maplike doesn't make much sense

w3c@c10855a wasn't sufficient.

Author: litherum

css-fonts-4/Overview.bs

@@ -6884,9 +6884,6 @@ interface CSSFontPaletteValuesRule : CSSRule {
   readonly attribute CSSOMString overrideColor;
 };</pre>
 
-The value of the 'maplike' function [=CSS/parses=] as a <<color>>. If it is not a color,
-	[=throw=] a {{SyntaxError}}.
-
 The <code>fontFamily</code> and <code>basePalette</code> interfaces are parsed according to the appropriate CSS property syntax.
 
 <h2 id="platform-props-to-css" class="no-num">