[css-values-5] Update changes list.

Author: fantasai

css-values-5/Overview.bs

@@ -2441,6 +2441,11 @@ Acknowledgments</h2>
 <h2 class="no-num" id="changes">
 Changes</h2>
 
+	Changes since the <a href="https://www.w3.org/TR/2024/WD-css-values-5-20240913/">First Public Working Draft</a> include:
+
+	* Incorporated the definition of <<position>>,
+		extending it to handle [=flow-relative=] positions.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/549#issuecomment-1823607623">Issue 549</a>)
 
 <h3 class=no-num id="additions-L4">
 Additions Since Level 4</h3>
@@ -2449,6 +2454,8 @@ Additions Since Level 4</h3>
 
 	* Added the "comma-upgrading" rules for functional notations.
 	* Defined several <<url-modifier>>s for <<url>> functions.
+	* Extended <<position>> to handle [=flow-relative=] positions.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/549#issuecomment-1823607623">Issue 549</a>)
 	* Added the [[#progress|*-progress()]] family of functions, to represent interpolation progress between two values.
 	* Added the [[#mixing|*-mix()]] family of functions, to represent actually interpolating between two values.
 	* Added ''first-valid()'', to allow CSS's forward-compatible parsing behavior (drop invalid things, go with what's left) to be used with custom properties and other contexts where validity isn't known until <em>after</em> parsing.