[css-color-4][editorial] Update changes

Author: svgeesus

css-color-4/Overview.bs

@@ -6453,6 +6453,14 @@ Changes</h2>
 </h3>
 
 <ul>
+	<!-- to 30 Mar 2023 -->
+	<li>Stop claiming that achromatic colors have missing a,b, or chroma</li>
+	<li>HSL and HWB changed to unbounded gamut, to promote round-tripping</li>
+	<li>Defined percentage reference range for HSL</li>
+	<li>Modern color syntax hsl() and hsla() allow mixed number and percentage components</li>
+	<li>Modern color syntax rgb() and rgba() allow mixed number and percentage components</li>
+	<li>Define the term "modern color syntax" (legacy color syntax already defined).</li>
+	<li>Consistently use the term "analogous components"</li>
 	<!-- to  7 Feb 2023 -->
 	<li>Changed to allow all predefined color spaces for interpolation</li>
 	<li>Clarified that for color(), three parameters (RGB or XYZ) are required</li>