doc: fix examples in netmap compatibility guide
doc: fix examples in netmap compatibility guide

Fix the examples in the netmap compatibility sample application
docs which referred to the packet_reordering application.

Also fix some minor rst formatting issues.

Reported-by: Qian Xu <81156ea8c687d383f58bd067d87c20618b5afdb1@intel.com>
Signed-off-by: John McNamara <af31595c36a4239b9676e9b3a777d3e2f15a6c4d@intel.com>
Acked-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>

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