[mediaqueries] Fix draft url.

Author: tabatkins

mediaqueries/Overview.bs

@@ -1,12 +1,11 @@
-<h1>Media Queries Level 4</h1>
-
 <pre class='metadata'>
+Title: Media Queries Level 4
 Group: csswg
 Shortname: mediaqueries
 Level: 4
 Status: ED
 Work Status: Exploring
-ED: https://drafts.csswg.org/mediaqueries4/
+ED: https://drafts.csswg.org/mediaqueries-4/
 TR: https://www.w3.org/TR/mediaqueries-4/
 Previous Version: https://www.w3.org/TR/2014/WD-mediaqueries-4-20140605/
 Editor: Florian Rivoal, Vivliostyle, florian@rivoal.net, http://vivliostyle.com