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

Author: Chris Lilley

css-color-4/Overview.bs

@@ -6512,6 +6512,12 @@ Changes</h2>
 </h3>
 
 <ul>
+	<!-- to 10 May 2023 -->
+	<li>Added examples of specified out of range alpha, with and without calc()</li>
+	<li>Placed examples of serializing with trimmed trailing zeroes clorer to the relevant text</li>
+	<li>clarified example, used value of text-shadow</li>
+	<li>Clarified resolving currentColor</li>
+	<li>Updated acknowledgments</li>
 	<!-- 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>