doc: update release notes
Update the DPDK 2.2 release notes with recent fixes:
9db649 eal/linux: fix epoll timeout
d49e0f hash: fix memory allocation of cuckoo key table
7fcd13 ixgbe: fix X550 DCB
5e73f4 ixgbe: remove burst size restriction of vector Rx
7e01e3 i40e: fix base driver allocation when not using first numa node
d53364 vhost: fix qemu shutdown
The order of sections (and inside) is inspired from MAINTAINERS file.
Signed-off-by: John McNamara <john.mcnamara@intel.com>
Signed-off-by: Thomas Monjalon <thomas.monjalon@6wind.com>