[css-ruby] Point to the latest DoC

Author: frivoal

css-ruby-1/Overview.bs

@@ -133,7 +133,7 @@ Module interactions</h3>
 	ISSUE: Issues are being tracked both
 	<a href="https://github.com/w3c/csswg-drafts/issues">in GitHub</a>
 	as well as in this
-	<a href="http://drafts.csswg.org/css-ruby-1/issues-wd-2014">Disposition of Comments</a>
+	<a href="http://drafts.csswg.org/css-ruby-1/issues-wd-2020">Disposition of Comments</a>
 	tracking issues raised on <a href="http://lists.w3.org/Archives/Public/www-style/">www-style</a>.
 
 <h3 id="values">