bpf: Improve bpf_redirect_neigh helper description
Follow-up to address David's feedback that we should better describe internals of the bpf_redirect_neigh() helper. Suggested-by: NDavid Ahern <dsahern@gmail.com> Signed-off-by: NDaniel Borkmann <daniel@iogearbox.net> Signed-off-by: NAlexei Starovoitov <ast@kernel.org> Reviewed-by: NDavid Ahern <dsahern@gmail.com> Link: https://lore.kernel.org/bpf/20201010234006.7075-2-daniel@iogearbox.net
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