doc: add missing new EAL options in testpmd guide
doc: add missing new EAL options in testpmd guide

Added information on testpmd user guide
for -l, --lcores and --master-lcore options

Signed-off-by: Pablo de Lara <28355d9cfe41bb8148aea0fb24f47aae8f4217a1@intel.com>
Acked-by: Siobhan Butler <8cf2da75f16c15b95e66f52a35c85d9ba5dc91d6@intel.com>

msune/dpdk,tsphillips/dpdk-fork,john-mcnamara-intel/dpdk,tsphillips/dpdk-fork,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,venkynv/dpdk-mirror,msune/dpdk,mixja/dpdk,mixja/dpdk,mixja/dpdk,john-mcnamara-intel/dpdk,venkynv/dpdk-mirror,venkynv/dpdk-mirror,tsphillips/dpdk-fork,msune/dpdk,venkynv/dpdk-mirror,tsphillips/dpdk-fork,msune/dpdk,mixja/dpdk