[css-2015][css-2017][css-2018][css-2020] Mark EDs as EDs in bikeshed

Fixes some of the metadata generation on the draft server

Author: frivoal

css-2015/Overview.bs

@@ -2,7 +2,7 @@
 Title: CSS Snapshot 2015
 Shortname: css-2015
 Level: none
-Status: NOTE
+Status: ED
 Group: CSSWG
 Work Status: Completed
 URL: https://drafts.csswg.org/css-2015/

css-2017/Overview.bs

@@ -2,7 +2,7 @@
 Title: CSS Snapshot 2017
 Shortname: css-2017
 Level: none
-Status: NOTE
+Status: ED
 Group: CSSWG
 Work Status: Completed
 URL: https://drafts.csswg.org/css-2017/

css-2018/Overview.bs

@@ -2,7 +2,7 @@
 Title: CSS Snapshot 2018
 Shortname: css-2018
 Level: none
-Status: WG-NOTE
+Status: ED
 Group: CSSWG
 Work Status: revising
 URL: https://drafts.csswg.org/css-2018/

css-2020/Overview.bs

@@ -2,7 +2,7 @@
 Title: CSS Snapshot 2020
 Shortname: css-2020
 Level: none
-Status: WG-NOTE
+Status: ED
 Group: CSSWG
 Work Status: revising
 URL: https://drafts.csswg.org/css-2020/
@@ -24,6 +24,8 @@ spec:css-sizing-3; type:value; for:width; text:max-content
 <div boilerplate=status>
 	This document is a work in progress,
 	aimed at representing the state of CSS as of 2020.
+	It should become a Working Group Note when completed.
+
 	<!-- Replace the above with this when publishing to TR:
 	This document represents the state of CSS as of 2020.
 	The CSS Working Group does not expect any further changes to this document: