[css-color-4][editorial] Update changes to 21 June

Author: svgeesus

css-color-4/Overview.bs

@@ -7054,7 +7054,22 @@ 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>
-	<li><i>none</i></li>
+	<!-- to 21 June -->
+	<li>Added another  xyz-d65 and xyz-d50 example</li>
+	<li>Clarify which component (Y) in XYZ corresponds to brightness</li>
+	<li>Clarified that CSS gamut mapping applies on actual, not used, values</li>
+	<li>Removed hue normalization from the hslToRgb sample code, as the input is already normalized at parse time</li>
+	<li>Corrected the pseudo-code for step 4 of the gamut mapping algorithm</li>
+	<li>Clarified that interpolation is the most common situation which combines two colors, but not the only one. </li>
+	<li>Ensured adequate contrast for text in the deltaE table</li>
+	<li>Removed remaining use of the term &lt;absolute-color-function>, use &lt;absolute-color> function instead for consistency</li>
+	<li>Updated acknowledgements section</li>
+	<li>Added gamut mesh diagram</li>
+	<li>Described CSSOM serialization in terms of declared values rather than specified values</li>
+	<li>Added exported definition of luminance</li>
+	<li>Added production rule for &lt;opacity-value> </li>
+	<li>Clarified when results from hslToRgb will be in [0,1]</li>
+	<li>Clarified that once linearized, RGB spaces are additive</li>
 </ul>
 
 <h3 id="changes-from-20221101">Changes since the