[FIXED JENKINS-3935] add build description to feeds.

(recording the previous commit 9d7d0d75 by Richie Vos)

changelog.html

@@ -58,6 +58,9 @@ Upcoming changes</a>
   <li class=bug>
     Windows XP slave stopped working in 1.396 (related to name change)
     (<a href="http://issues.jenkins-ci.org/browse/JENKINS-8676">issue 8676</a>)
+  <li class=rfe>
+    build RSS feeds now contain description of builds.
+    (<a href="http://issues.jenkins-ci.org/browse/JENKINS-3935">issue 3935</a>)
   <li class=rfe>
     Debian package will force-terminate Jenkins if it fails to shut down in 5 seconds.
     (<a href="http://issues.jenkins-ci.org/browse/JENKINS-5415">issue 5415</a>)