[css-backgrounds-3] Corrected changes title

Author: SebastianZ

css-backgrounds-3/Overview.bs

@@ -2559,8 +2559,8 @@ The lists below describe which features from this specification are in each leve
 <h2 id="changes">
 Changes</h2>
 
-<h3 id="changes-2024-02">
-Changes since the 14 February 2024 Candidate Recommendation Snapshot</h3>
+<h3 id="changes-2023-02">
+Changes since the 14 February 2023 Candidate Recommendation Snapshot</h3>
 
 <ul>
   <li>Reverted <a href="#bg-color-move">change moving &lt;color> to the front of &lt;final-bg-layer></a>