Updated README to fix code formatting

- Updated README to fix code formatting

Author: rajalokan

messaging/rabbitmq/readme.md

@@ -29,9 +29,11 @@ docker exec -it rabbit-manager rabbitmqctl cluster_status
 
 # Enable Statistics
 
+```
 docker exec -it rabbit-1 rabbitmq-plugins enable rabbitmq_management
 docker exec -it rabbit-2 rabbitmq-plugins enable rabbitmq_management
 docker exec -it rabbit-3 rabbitmq-plugins enable rabbitmq_management
+```
 
 # Message Publisher
 
@@ -162,4 +164,4 @@ docker rm -f rabbit-3
 
 # RabbitMQ on Kubernetes
 
-Checkout the Kubernetes walkthrough [here](./kubernetes/readme.md)
+Checkout the Kubernetes walkthrough [here](./kubernetes/readme.md)