doc: fix a typo in testpmd guide
doc: fix a typo in testpmd guide

This patch fixes a typo in testpmd guide (should be ICMP and not IMCP).

Fixes: ac718398f477 ("doc: testpmd application user guide")
Cc: stable@dpdk.org

Signed-off-by: Rami Rosen <d906574dd7f018d5d95e7b7a8107cdf708745f05@gmail.com>
Acked-by: Bernard Iremonger <233eeff376ad0c06f66f06c5522ea3c4feb30d3b@intel.com>
Acked-by: Marko Kovacevic <32a723043e16bf2a3185e32c2e613ae1ee55288f@intel.com>

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