[css-grid-2] Graduate to ED, now that we have FPWD. ;)

Author: fantasai

css-grid-2/Overview.bs

@@ -2,7 +2,7 @@
 Title: CSS Grid Layout Module Level 2
 Shortname: css-grid
 Level: 2
-Status: UD
+Status: ED
 Group: csswg
 Work Status: exploring
 ED: https://drafts.csswg.org/css-grid-2/