doc: add tested platforms with Mellanox NICs
doc: add tested platforms with Mellanox NICs

Add tested platforms with Mellanox NICs to the 21.11 release notes.

Signed-off-by: Raslan Darawsheh <18fd192a829ab99382a9c480ddb6085edf3e8489@nvidia.com>

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