[css-display] Removed hardcoded date from ED

Author: frivoal

css-display/Overview.bs

@@ -3,7 +3,6 @@
 <pre class='metadata'>
 Status: ED
 Work Status: Revising
-Date: 2014-09-11
 ED: http://dev.w3.org/csswg/css-display/
 Shortname: css-display
 Group: csswg