doc: describe raw mode of FDIR in testpmd
doc: describe raw mode of FDIR in testpmd

Add description of raw flow type mode for flow_director_filter
command in testpmd. Modify description of flow type parameter
for functions set_hash_global_config, set_hash_input_set and
set_fdir_input_set.

Signed-off-by: Kirill Rybalchenko <d880e0ae5db127fbe2da80167dd3959919ed806d@intel.com>
Acked-by: John McNamara <af31595c36a4239b9676e9b3a777d3e2f15a6c4d@intel.com>
Acked-by: Wenzhuo Lu <58cb9036bdff9a5412edc3b9f70e105ccf59954f@intel.com>

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