[css-color-4][editorial] Clarification of wording regarding aims of CSS gamut mapping

Author: svgeesus

css-color-4/Overview.bs

@@ -5817,7 +5817,9 @@ CSS Gamut Mapping to an RGB Destination</h3>
 	colors inside the destination gamut
 	could be changed.
 
-	CSS gamut mapping occurs in the <a href="#ok-lab">OkLCh color space</a>.
+	All three CSS gamut mapping algorithms aim at 
+	constant-lightness, constant-hue chroma reduction 
+	in the <a href="#ok-lab">OkLCh color space</a>.
 
 	For colors which are out of range on the Lightness axis,
 	white is returned in the destination color space