[css-highlight-api-1][editorial] add w3cid

Author: svgeesus

css-color-4/Overview.bs

@@ -6,7 +6,7 @@ Prepare for TR: yes
 Work Status: Refining
 ED: https://drafts.csswg.org/css-color/
 TR: https://www.w3.org/TR/css-color-4/
-Previous Version: https://www.w3.org/TR/2021/WD-css-color-4-20210601/
+<!-- Previous Version: https://www.w3.org/TR/2021/WD-css-color-4-20210601/ -->
 Shortname: css-color
 Group: csswg
 Level: 4