[css-box-3] Revert status to ED

Author: fantasai

css-box-3/Overview.bs

@@ -2,12 +2,9 @@
 Title: CSS Box Model Module Level 3
 Shortname: css-box
 Level: 3
-Status: PR
-Prepare for TR: yes
-Date: 2023-02-16
-Deadline: 2023-03-16
+Status: ED
 Implementation Report: https://wpt.fyi/results/css/css-box
-Work Status: Refining
+Work Status: Completed
 Group: csswg
 ED: https://drafts.csswg.org/css-box-3/
 TR: https://www.w3.org/TR/css-box-3/