doc: fix NFP NIC guide grammar
doc: fix NFP NIC guide grammar

My english is far worse than those from the marketing team.

Fixes: 80bc1752f16e ("nfp: add guide")
Fixes: d625beafc8be ("doc: update NFP with PF support information")
Fixes: 80987c40fd28 ("config: enable nfp driver on Linux")
Cc: stable@dpdk.org

Signed-off-by: Alejandro Lucero <1ffca3a1926aae782ae3c39a5b308878ba1e5683@netronome.com>
Acked-by: Marko Kovacevic <32a723043e16bf2a3185e32c2e613ae1ee55288f@intel.com>

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