changes to training-cluster-by-script.xml
changes to training-cluster-by-script.xml

added comma and plural to commands
changed sentence with You
removed extra white space

Change-Id: Id2236a8655c08a2c992754cbd3ed15d74cbf5668

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