[css-cascade-3] Filled in rest of Changes list, based on reviewing the diff from last TR publication.

Author: tabatkins

css-cascade-3/Overview.bs

@@ -913,10 +913,17 @@ Changes Since the 19 May 2016 Candidate Recommendation</h3>
 	The following changes were made to this specification since the
 	<a href="https://www.w3.org/TR/2016/CR-css-cascade-3-20160519/">19 May 2016 Candidate Recommendation</a>:
 
-	<ul>
-		<li>Clarified that <a>custom properties</a> are not reset by the 'all' shorthand.
+	* Clarified that <a>custom properties</a> are not reset by the 'all' shorthand.
 		(<a href="https://github.com/w3c/csswg-drafts/issues/2518">2518</a>)
-	</ul>
+
+	* Defined more precisely that imported stylesheets are interpreted separately from the importing stylesheet,
+		in terms of ordering of rules, etc.
+
+	* Removed any mention of scoped stylesheets,
+		as the feature was removed from HTML.
+
+	* Removed any mention of the “override” origin,
+		originally defined by <a href="https://www.w3.org/TR/2000/REC-DOM-Level-2-Style-20001113/">DOM Level 2 Style</a>.
 
 <h3 id="changes-2013">
 Changes Since the 3 October 2013 Candidate Recommendation</h3>