[css-contain-2] Update changes section and previous version link

Author: frivoal

css-contain-2/Overview.bs

@@ -6,6 +6,7 @@ Status: ED
 Work Status: stable
 Group: csswg
 ED: https://drafts.csswg.org/css-contain-2/
+Previous Version: https://www.w3.org/TR/2019/WD-css-contain-2-20191111/
 Previous Version: https://www.w3.org/TR/2019/WD-css-contain-2-20191015/
 TR: https://www.w3.org/TR/css-contain-2/
 Editor: Tab Atkins, Google, http://xanthir.com/contact/, w3cid 42199
@@ -1539,10 +1540,17 @@ Answers are provided below.
 
 This appendix is <em>informative</em>.
 
+<h3 id="l1-changes">
+Changes from <a href="https://www.w3.org/TR/2019/WD-css-contain-2-20191111/">2019-11-11 Working Draft</a>
+</h3>
+
+* Define the interaction between [=paint containment=] and 'overflow-clip-margin'
+* Add the 'content-visibility' property
+* Editorial improvements and clarifications to size and paint containment (in sync with the same improvements made to Level 1)
+
 <h3 id="l1-changes">
 Changes from <a href="https://www.w3.org/TR/css-contain-1/">CSS Containment Level 1</a>
 </h3>
 
 * Restored [=style containment=], which had been dropped from Level 1
-* Define the interaction between [=paint containment=] and 'overflow-clip-margin'