[css-align] Update changes section.

Author: tabatkins

css-align/Overview.bs

@@ -1052,12 +1052,23 @@ Aligning Boxes by Baseline</h3>
 	Position this <dfn>aligned subtree</dfn> within the alignment container
 	according to the rules of the <a>box alignment properties</a> in effect.
 
+<!--
+ ██████  ██     ██    ███    ██    ██  ██████   ████████  ██████
+██    ██ ██     ██   ██ ██   ███   ██ ██    ██  ██       ██    ██
+██       ██     ██  ██   ██  ████  ██ ██        ██       ██
+██       █████████ ██     ██ ██ ██ ██ ██   ████ ██████    ██████
+██       ██     ██ █████████ ██  ████ ██    ██  ██             ██
+██    ██ ██     ██ ██     ██ ██   ███ ██    ██  ██       ██    ██
+ ██████  ██     ██ ██     ██ ██    ██  ██████   ████████  ██████
+-->
+
 <h2 id="changes">
 Changes</h2>
 
 	Changes since the <a href="http://www.w3.org/TR/2014/WD-css-align-3-20141218/">previous Working Draft</a> include:
 
 	* Fixed handling of ''justify-self: stretch'' (and 'align-self') to allow shrinking, as defined in Flexbox.
+	* Made justify/align-content:auto computte to their respective behaviors for flex and grid containers.
 
 <h2 class=no-num id="acknowledgments">
 Acknowledgments</h2>