minor cleanup to card037-rabbitmq
minor cleanup to card037-rabbitmq

incorrect sentence structure
added "Add a" before 2 last sentences

Change-Id: I3a37eb6eb665680988c42b201f40fdb23f308dba

Nabs007/training-guides,Nabs007/training-guides,harrisonfeng/training-guides,openstack/training-guides,Nabs007/training-guides,harrisonfeng/training-guides,openstack/training-guides,harrisonfeng/training-guides