Update the 'High Performance of Small Packets on 40G NIC' section of the
Getting Started Guide (GSG) as the firmware version referenced for a NIC
using the i40e driver was version 4.2.5 which is no longer validated.
Instruct users to consult release notes for current validated firmware
versions.
Signed-off-by: Ian Stokes <ian.stokes@intel.com>
Acked-by: John McNamara <john.mcnamara@intel.com>