doc: group mlx5 shared actions
doc: group mlx5 shared actions

Put all supported shared actions in one new table

Signed-off-by: Xiaoyu Min <03352a7947822e04037757091119acfbe3910106@nvidia.com>
Reviewed-by: Asaf Penso <746757a14b395630db06bf3a91769c61eb5e1eb7@nvidia.com>

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