bpf: Rename tcp_bbf.readme to tcp_bpf.readme

The original patch had the wrong filename.

Fixes: bfdf75693875 ("bpf: create samples/bpf/tcp_bpf.readme")
Signed-off-by: Lawrence Brakmo <brakmo@fb.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/samples/bpf/tcp_bbf.readme b/samples/bpf/tcp_bpf.readme
similarity index 100%
rename from samples/bpf/tcp_bbf.readme
rename to samples/bpf/tcp_bpf.readme