[css-display-3] Update Changes list

Author: fantasai

css-display-3/Overview.bs

@@ -1301,7 +1301,9 @@ Changes</h2>
 		(<a href="https://github.com/w3c/csswg-drafts/issues/1716">Issue 1716</a>)
 	* Added definition for <a>document order</a>.
 	* Added missing SVG elements to <a href="#unbox">Appendix B</a>’s details on ''display: contents''
-		(<a href="https://github.com/w3c/csswg-drafts/issues/2118">Issue 2118</a>)
+		(<a href="https://github.com/w3c/csswg-drafts/issues/2118">Issue 2118</a>),
+		clarified effect of SVG attributes
+		(<a href="https://github.com/w3c/csswg-drafts/issues/2502">Issue 2502</a>),
 		and defined behavior for MathML
 		(<a href="https://github.com/w3c/csswg-drafts/issues/2167">Issue 2167</a>).
 	* Added some <a href="#box-guidelines">guidance</a> to future spec authors of anonymous box construction rules.