Fix notice file

git-svn-id: https://svn.apache.org/repos/asf/incubator/ambari/trunk@1456330 13f79535-47bb-0310-9956-ffa450edef68

NOTICE.txt

@@ -1,7 +1,7 @@
 Apache Ambari
 Copyright 2011-2013 The Apache Software Foundation
 
-This product includes software developed by The Apache Software
+This product includes software developed at The Apache Software
 Foundation (http://www.apache.org/).
 
 Component ambari-common/src/test/python are under the following copyright: