doc: add vhost multi-queue reconnection issue
doc: add vhost multi-queue reconnection issue

This patch added known issue for vhost multi-queue reconnection
with virtio-net/virtio-pmd.

Signed-off-by: Xuan Ding <31a30f992ded31cfb4c030a8612d2ba3ea85d25e@intel.com>
Reviewed-by: Maxime Coquelin <9a2667dee3b90866bbc9c2696cff2b7d5616c95a@redhat.com>

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