[css-contain-3] Proper version link

Author: mirisuzanne

css-contain-3/Overview.bs

@@ -5,7 +5,7 @@ Shortname: css-contain
 Status: ED
 Work Status: Exploring
 Group: csswg
-ED: https://drafts.csswg.org/css-contain-2/
+ED: https://drafts.csswg.org/css-contain-3/
 Previous Version: https://www.w3.org/TR/2020/WD-css-contain-2-20201216/
 Previous Version: https://www.w3.org/TR/2020/WD-css-contain-2-20200603/
 Previous Version: https://www.w3.org/TR/2019/WD-css-contain-2-20191111/