Fix URL

changelog.html

@@ -77,7 +77,7 @@ Upcoming changes</a>
 <h3><a name=v2.29>What's new in 2.29</a> (2016/11/06)</h3>
 <p>
   <b class="color:red">Warning!</b> This release is not recommended for use due to 
-  <a href="https://issues.jenkins-ci.org/browse/JENKINS-39535">issue 39555</a>
+  <a href="https://issues.jenkins-ci.org/browse/JENKINS-39555">issue 39555</a>
   and <a href="https://issues.jenkins-ci.org/browse/JENKINS-39414">issue 39414</a>.
   We are working on the out-of-order release (<a href="https://groups.google.com/forum/#!topic/jenkinsci-dev/kceM9T8NEdg">discussion</a>).
 </p>