doc: fix typo in contributors guide
doc: fix typo in contributors guide

Bugzilla ID: 422
Fixes: 9e0e4a00df77 ("doc: suggest to keep doc and code in same patch")
Cc: stable@dpdk.org

Signed-off-by: Muhammad Bilal <cfc64ac5bddd93a8a7484b621936fd1774c1afcc@emumba.com>

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