[css-gcpm-3] Update Changes section

Author: xfq

css-gcpm-3/Overview.bs

@@ -896,7 +896,15 @@ h6 { bookmark-level: 6 }
 
 <h2 class="no-num" id="changes">Appendix C: Changes</h2>
 
-  Changes since the <a href="https://hg.csswg.org/drafts/raw-file/6a5c44d11c2b/css-gcpm/Overview.html">24 September 2013 Editor’s Draft</a> are:
+Changes since the <a href="http://www.w3.org/TR/2014/WD-css-gcpm-3-20140513/">13 May 2014 Working Draft</a>:
+
+<ul>
+	<li>Clarify that bookmark is only created via 'bookmark-level' property. Remove <css>none</css> value from 'bookmark-label'.</li>
+	<li>Move the cross references, leaders, and bookmarks sections to the <a href="https://www.w3.org/TR/css-content-3/">CSS Generated Content Module</a>.</li>
+</ul>
+
+
+  Changes since the <a href="https://hg.csswg.org/drafts/raw-file/6a5c44d11c2b/css-gcpm/Overview.html">24 September 2013 Editor’s Draft</a>:
 
 
 <ul>
@@ -913,7 +921,8 @@ h6 { bookmark-level: 6 }
 
 
 </ul>
-In addition to the above changes, many other changes have been made since the <a href="https://www.w3.org/TR/2011/WD-css3-gcpm-20111129/">29 November 2011 Working Draft</a>:
+
+Changes since the <a href="https://www.w3.org/TR/2011/WD-css3-gcpm-20111129/">29 November 2011 Working Draft</a>:
 
 <ul>
 <li>