Try to fix javadoc

Author: rainerjung

java/org/apache/catalina/ha/backend/HeartbeatListener.java

@@ -25,7 +25,7 @@
 
 /**
  * Lifecycle listener that provides heartbeat information to mod_heartbeat for Apache HTTP Server.
- * Message format: "v=%u&ready=%u&busy=%u"
+ * Message format: "v=%u&ready=%u&busy=%u"
  */
 public class HeartbeatListener implements LifecycleListener {