Since xsk APIs has been removed from libbpf, let's clean up the
BPF docs simutaneously.
Signed-off-by: NPu Lehui <pulehui@huawei.com>
Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net>
Acked-by: NSong Liu <song@kernel.org>
Link: https://lore.kernel.org/bpf/20220708042736.669132-1-pulehui@huawei.com