bpf, doc: Add arm32 as arch supporting eBPF JIT

As eBPF JIT support for arm32 was added recently with
commit 39c13c20

, it seems appropriate to
add arm32 as arch with support for eBPF JIT in bpf and sysctl docs as well.

Signed-off-by: Shubham Bansal <illusionist.neo@gmail.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>