[css-transitions-1][editorial] Tidy up and linkfix changes section

Author: svgeesus

css-transitions-1/Overview.bs

@@ -1351,17 +1351,23 @@ CSS properties to have particular values.
 The cascade also allows users to disable transitions entirely
 by overriding the transition properties.
 
-Changes since Working Draft of 30 November 2017 {#changes}
-==========================================================
+Changes {#changes}
+==================
+
+Changes since Working Draft of 11 October 2018 {#changes-2018} 
+--------------------------------------------------------------
 
 The following are the substantive changes made since the
-<a href="https://www.w3.org/TR/2017/WD-css-transitions-1-20171130/">Working Draft
+<a href="https://www.w3.org/TR/2018/WD-css-transitions-1-20181011/">Working Draft
 dated 11 October 2018</a>:
 
-*   (Nothing yet)
+*   (Not up to date)
 
 For more details on these changes, see the version control
-<a href="https://github.com/w3c/csswg-drafts/commits/master/css-transitions-1/Overview.bs">change log</a>.
+<a href="https://github.com/w3c/csswg-drafts/commits/main/css-transitions-1/Overview.bs">change log</a>.
+
+Earlier changes {#changes-earlier}
+----------------------------------
 
 For changes in earlier working drafts: