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

Author: svgeesus

css-color-4/Overview.bs

@@ -7188,7 +7188,9 @@ Changes</h2>
 <h3 id="changes-from-20240213">Changes since the <a href="https://www.w3.org/TR/2024/CRD-css-color-4-20240213/">Candidate Recommendation Draft of 13 Feb 2024</a></h3>
 
 <ul>
-	<!-- to 8 Feb 2025 -->
+	<!-- to 1 Apr 2025 -->
+	<li>Defined epsilon for returning missing hue</li>
+	<li>Used a more precise definition of achromatic colors with missing hues (sufficiently close to the central axis)</li>
 	<li>Consistently use "color component" rather than "color channel" (both were being used).</li>
 	<li>Correlated Color Temperature was used without being defined or explained. Added informative reference.</li>
 	<li>Exported term premultiplied, linked to it consistently</li>