Add more comments that explain example & usage
Add more comments that explain example & usage

Change-Id: I888200f2afbbc9d4118ebf1c8d2a2cf9a232e560

citrix-openstack-build/taskflow,openstack/taskflow,junneyang/taskflow,pombredanne/taskflow-1,citrix-openstack-build/taskflow,openstack/taskflow,pombredanne/taskflow-1,varunarya10/taskflow,varunarya10/taskflow,jimbobhickville/taskflow,jimbobhickville/taskflow,junneyang/taskflow