bus/pci: fix a typo in doxygen file description
bus/pci: fix a typo in doxygen file description

Fixes: 764bf26873b9 ("add FreeBSD support")

Signed-off-by: Jerin Jacob <5bca7d2a432bc0f5422b70b2701a4e4fa32edd00@caviumnetworks.com>

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