Make a few minor updates to node shell help strings
Make a few minor updates to node shell help strings

Make a few minor updates to node shell help strings

Change-Id: I588b62108ea610b5c21f9ce9bc2a97841ac574f3

varunarya10/python-ironicclient,openstack/python-ironicclient,NaohiroTamura/python-ironicclient,CiscoUcs/UCS-python-ironicclinet,ramineni/myclient,rdo-management/python-ironicclient,bcrochet/python-ironicclient,redhat-openstack/python-ironicclient,NaohiroTamura/python-ironicclient,JioCloud/python-ironicclient,openstack/python-ironicclient