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

Author: svgeesus

css-values-4/Overview.bs

@@ -5138,6 +5138,8 @@ Recent Changes</h3>
 	Substantial changes since <a href="https://www.w3.org/TR/2022/WD-css-values-4-20221019/">19 October 2022 WD</a>:
 	<ul>
 
+		<li>Color type defined to be non-additive 
+			(<a href="https://github.com/w3c/csswg-drafts/issues/8576">Issue 8576</a>)</li>
 		<li>Added [[#component-functions]] to formally define the way that [=functional notation=] syntaxes are defined.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/2921">Issue 2921</a>)
 		<li>Added algorithm for [=snap as a border width=],