Add missing character
Add missing character

This missing character was causing a warning during the creation of
documentation.  This warning message was considered an error ending the
process to create documentation.

Change-Id: I745389150c23ffabe25eab0ead78dfc850885e9d
Closes-Bug: #1547164

cloudbase/neutron,klmitch/neutron,klmitch/neutron,openstack/neutron,noironetworks/neutron,eayunstack/neutron,bigswitch/neutron,igor-toga/local-snat,eayunstack/neutron,huntxu/neutron,igor-toga/local-snat,mahak/neutron,sebrandon1/neutron,bigswitch/neutron,sebrandon1/neutron,MaximNevrov/neutron,dims/neutron,dims/neutron,cloudbase/neutron,mahak/neutron,openstack/neutron,MaximNevrov/neutron,wolverineav/neutron,huntxu/neutron,noironetworks/neutron,mahak/neutron,openstack/neutron,wolverineav/neutron