updated changelog for release

changelog.html

@@ -55,6 +55,11 @@ Upcoming changes</a>
 
 <!-- Record your changes in the trunk here. -->
 <div id="trunk" style="display:none"><!--=TRUNK-BEGIN=-->
+<ul class=image>
+  <li class=>
+</ul>
+</div><!--=TRUNK-END=-->
+<h3><a name=v2.23>What's new in 2.23</a> (2016/09/18)</h3>
 <ul class=image>
   <li class="bug">
     Fix JS/browser memory leak on Jenkins dashboard.
@@ -66,7 +71,6 @@ Upcoming changes</a>
     Properly enable submit button on New Item page when choosing item type first.
     (<a href="https://issues.jenkins-ci.org/browse/JENKINS-36539">issue 36539</a>)
 </ul>
-</div><!--=TRUNK-END=-->
 <h3><a name=v2.22>What's new in 2.22</a> (2016/09/11)</h3>
 <ul class=image>
   <li class="rfe">