Changed formatting for consistency

changelog.html

@@ -60,7 +60,9 @@
 </div><!--=TRUNK-END=-->
 <h3><a name=v1.638>What's new in 1.638</a> (2015/11/11)</h3>
 <ul class=image>
-  <li class="major bug"><strong><a href="https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2015-11-11">Important security fixes</a></strong>
+  <li class="major bug">
+    <strong>Important security fixes</strong>
+    (<a href="https://wiki.jenkins-ci.org/display/SECURITY/Jenkins+Security+Advisory+2015-11-11">security advisory</a>)
 </ul>
 <h3><a name=v1.637>What's new in 1.637</a> (2015/11/08)</h3>
 <ul class=image>