Update jobboard docs
Update jobboard docs

Add parameter definitions to a few critical methods.

Change-Id: I34067574ddff4378377cbd0f1870f36fdba64107

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