[css-counter-styles] Add Changes section.

Author: tabatkins

css-counter-styles/Overview.bs

@@ -2589,7 +2589,19 @@ Sample style sheet for HTML</h2>
 
 
 <h2 class='no-num' id='changes'>
-Changes since the Feb 2015 Candidate Recommendation</h2>
+
+<h3 id='changes-jun-2015'>
+Changes since the Jun 2015 Candidate Recommendation</h3>
+
+	Significant changes since the <a href="https://www.w3.org/TR/2015/CR-css-counter-styles-3-20150611/">June 11 2015 CR</a> draft:
+
+	* Exclude "none" and "disc" from being the name of a counter style.
+	* When setting CSSCounterStyle.name, take the string directly; don't [=CSS/parse=] it as an ident.
+
+	A <a href="https://drafts.csswg.org/css-counter-styles-3/issues-cr-20150611">Disposition of Comments</a> is available.
+
+<h3 id='changes-feb-2015'>
+Changes since the Feb 2015 Candidate Recommendation</h3>
 
 	* Allowed UAs to extend the ''hebrew'' style past the spec-defined limits
 		(since the current limits are mostly just an artifact of how annoying it is to go higher with the ''@counter-style''-based definition).
@@ -2628,4 +2640,4 @@ Acknowledgments</h2>
 <h2 class="no-num" id="priv-sec">
 Privacy and Security Considerations</h2>
 
-	This specification introduces no new privacy or security considerations.
+	This specification introduces no new privacy or security considerations.