dedup IDs

Author: svgeesus

css-color-5/Overview.bs

@@ -3493,7 +3493,7 @@ This specification adds a way to ensure adequate contrast for text whose backgro
 	Changes
 </h2>
 
-<h3 id="changes">
+<h3 id="changes-20250318">
 	Since the <a href="https://www.w3.org/TR/2025/WD-css-color-5-20250318/">Working Draft of 18 March 2025</a>
 </h3>