Small documentation fix
Small documentation fix

Change-Id: I31959cd9ea0465bf9aabb3a222cb45630cde8f66

openstack/taskflow,jimbobhickville/taskflow,jimbobhickville/taskflow,pombredanne/taskflow-1,junneyang/taskflow,openstack/taskflow,junneyang/taskflow,pombredanne/taskflow-1