[css-color-5][editorial] Update changes list

Author: svgeesus

css-color-5/Overview.bs

@@ -3702,7 +3702,12 @@ This specification adds a way to ensure adequate contrast for text whose backgro
 </h3>
 
 <ul>
-	<!-- to 20 August 2025 -->
+	<!-- to 7 Jan 2026 -->
+	<li>Added backlinks from relative colors to the corresponding definition in CSS Color 4 (<a href="https://github.com/w3c/csswg-drafts/issues/13286">Issue 13286</a>)</li>
+	<li>Defined that if there are multiple @color-profile rules, the last one wins <a href="https://github.com/w3c/csswg-drafts/issues/12980">Issue 12980</a>)</li>
+	<li>Default to oklab for color-mix(), allow color-interpolation-method to be omitted (<a href="https://github.com/w3c/csswg-drafts/issues/10484">Issue 10484</a>)</li>
+	<li>Removed leftover text which still assumed color-mix() was limited to two colors</li>
+	<li>Updated serialization of origin colors (<a href="https://github.com/w3c/csswg-drafts/issues/10328">Issue 10328</a>)</li>
 	<li>Added display-p3-linear to color spaces for interpolation</li>
 	<li>Added the alpha() RCS function</li>
 	<li>Updated explanatory prose which still limited color-mix to two colors</li>