i40e: fix typo in flow director comment
i40e: fix typo in flow director comment

Signed-off-by: Rami Rosen <7f5a0f674127d5d5a91ecfe3b41be456d732af3d@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk