[css-scrollbars] Post publication update

Author: frivoal

css-scrollbars-1/Overview.bs

@@ -7,6 +7,7 @@ Status: ED
 Work Status: Revising
 ED: https://drafts.csswg.org/css-scrollbars/
 TR: https://www.w3.org/TR/css-scrollbars-1/
+Previous version: https://www.w3.org/TR/2021/WD-css-scrollbars-1-20210908/
 Previous version: https://www.w3.org/TR/2021/WD-css-scrollbars-1-20210829/
 Previous version: https://www.w3.org/TR/2021/WD-css-scrollbars-1-20210805/
 Previous version: https://www.w3.org/TR/2018/WD-css-scrollbars-1-20180925/