[css-counter-styles-3][editorial] Add to Changes section

Author: tabatkins

css-counter-styles-3/Overview.bs

@@ -2639,6 +2639,17 @@ Sample style sheet for HTML</h2>
 <h2 class='no-num' id='changes'>
 Changes</h2>
 
+<h3 id='changes-2021'>
+Changes since the July 2021 Candidate Recommendation</h3>
+
+	Significant changes since the <a href="https://www.w3.org/TR/2021/CR-css-counter-styles-3-20210727/">July 27 2021 Candidate Recommendation</a>:
+
+	* Restored the <css>fallback: cjk-decimal</css> descriptor
+		to the Korean styles
+		which was accidentally dropped in
+		<a href="https://github.com/w3c/csswg-drafts/commit/20a3d9ca02f235d8af13aa2bb05f725448371ad2">this commit</a>.
+		(<a href="https://github.com/w3c/csswg-drafts/issues/8870">Issue 8870</a>)
+
 <h3 id='changes-2017'>
 Changes since the December 2017 Candidate Recommendation</h3>