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

Author: svgeesus

css-color-4/Overview.bs

@@ -6331,6 +6331,9 @@ Changes</h2>
 </h3>
 
 <ul>
+	<li>Removed hue interpolation 'specified' value</li>
+	<li>Defined hue interpolation angle more precisely, maintaining differences of 360deg</li>
+	<li>Added example of carried forward alpha for premultiplication</li>
 	<!-- to 20 Oct 2022 -->
 	<li>Clarified a,b and C,h powerless at L=100% representing white.</li>
 	<li>Removed handwavy mention of L=400 which applies to hdr-CIELAB not CIE Lab</li>