[css-color-4] Fix ED link

Author: fantasai

css-color-4/Overview.bs

@@ -5,7 +5,7 @@ Date: 2022-11-01
 Deadline: 2023-01-05
 Prepare for TR: no
 Work Status: Testing
-ED: https://drafts.csswg.org/css-color/
+ED: https://drafts.csswg.org/css-color-4/
 TR: https://www.w3.org/TR/css-color-4/
 Previous Version: https://www.w3.org/TR/2022/CR-css-color-4-20221101/
 Shortname: css-color