[css-color-4] Three params are required, fix #8362

Author: svgeesus

css-color-4/Overview.bs

@@ -3477,7 +3477,7 @@ Specifying Predefined Colors: the ''color()'' function</h3>
 		this argument represents an <a>invalid color</a>.
 
 
-	* One or more <<number>>s or <<percentage>>s providing the parameter values that the color space takes.
+	* The three parameter values that the color space takes (RGB or XYZ values).
 
 	An out of gamut color has component values
 	less than 0 or 0%, or greater than 1 or 100%.