[css-counter-styles] Update the Changes list.

Author: tabatkins

css-counter-styles-3/Overview.bs

@@ -2598,6 +2598,11 @@ Changes since the Jun 2015 Candidate Recommendation</h3>
 
 	* 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.
+	* Clarify that counter styles are read out in the element's <a>content language</a>.
+	* Clarified that 'additive' tuples must be of <em>strictly</em> decreasing weight.
+	* Specified that invalid values just invalidate the declaration, not the whole rule.
+	* ''@counter-style'' rules that are invalid due to missing descriptors just fail to create a <a>counter style</a>;
+		they're otherwise still valid rules.
 
 	A <a href="https://drafts.csswg.org/css-counter-styles-3/issues-cr-20150611">Disposition of Comments</a> is available.