[css-color-5][editorial] update changes

Author: svgeesus

css-color-5/Overview.bs

@@ -3499,7 +3499,10 @@ This specification adds a way to ensure adequate contrast for text whose backgro
 </h3>
 
 <ul>
-	<!-- to 16 March 2025 -->
+	<!-- to 17 March 2025 -->
+	 <li>Clarified that component keywords can return ''none'' as well as a number</li>
+	 <li>Added examples of serialization of nested color functions</li>
+	 <li>Defined edge cases of color-mix() with calc, by WG resolution</li>
 	<li>Remove the "invalid if sum to zero" wording for color-mix(), per WG resolution</li>
 	<li>Consistently use of "color component" rather than "color channel" (both were used)</li>
 	<li>Simplified contrast-color(), per WG resolution</li>