Fix markup error in deploy/drivers.rst
Fix markup error in deploy/drivers.rst

the "=====" below OneView driver should be removed.

Change-Id: I88596770739eed0f0d7b516d182f8b5dcbeb03e3
Closes-bug: #1510104

pshchelo/ironic,hpproliant/ironic,ionutbalutoiu/ironic,NaohiroTamura/ironic,openstack/ironic,devananda/ironic,ionutbalutoiu/ironic,dims/ironic,SauloAislan/ironic,dims/ironic,bacaldwell/ironic,pshchelo/ironic,openstack/ironic,SauloAislan/ironic,bacaldwell/ironic,NaohiroTamura/ironic