Adding minor class-level JavaDoc.

realtime/src/main/java/com/metamx/druid/realtime/firehose/JacksonifiedConnectionFactory.java

@@ -10,6 +10,8 @@ import java.security.NoSuchAlgorithmException;
 import java.util.Map;
 
 /**
+ * A Jacksonified version of the RabbitMQ ConnectionFactory for better integration
+ * into the realtime.spec configuration file format.
  */
 public class JacksonifiedConnectionFactory extends ConnectionFactory
 {

realtime/src/main/java/com/metamx/druid/realtime/firehose/RabbitMQFirehoseConfig.java

@@ -3,6 +3,7 @@ package com.metamx.druid.realtime.firehose;
 import com.fasterxml.jackson.annotation.JsonProperty;
 
 /**
+ * A configuration object for a RabbitMQ connection.
  */
 public class RabbitMQFirehoseConfig
 {