DATAMONGO-1048 - Fix incomplete xml tag in reference documentation.

Author: christophstrobl

src/main/asciidoc/reference/redis-messaging.adoc

@@ -119,7 +119,7 @@ The preceding example uses the Redis namespace to declare the message listener c
  <map>
  <entry key-ref="messageListener">
  <bean class="org.springframework.data.redis.listener.ChannelTopic">
- <constructor-arg value="chatroom">
+ <constructor-arg value="chatroom"/>
  </bean>
  </entry>
  </map>