Update installing_clowder.rst (#383)

I believe there was a formatting issue in this yaml code on lines 216 and 239

Author: meerkatt

doc/src/sphinx/userguide/installing_clowder.rst

@@ -213,7 +213,7 @@ for details.), we must tell Clowder which ports the services are using.
          # Enable Clowder to communicate with the necessary services (Mongo, RabbitMQ, ElsticSearch)
          # Each service runs as a Docker container.
 
-         services:
+       services:
          mongo:
             ports:
                - 27017:27017
@@ -236,7 +236,7 @@ for details.), we must tell Clowder which ports the services are using.
          # Enable Clowder to communicate with the necessary services (Mongo, RabbitMQ, ElsticSearch)
          # Each service runs as a Docker container.
 
-         services:
+       services:
          mongo:
             ports:
                - 27017:27017