bpf-helpers.7: Refresh page

bpf-helpers.7: Refresh page

The script for generating this page is hosted in the Linux kernel
repository, as <scripts/bpf_doc.py>.  Run it as:

    $ /path/to/linux//scripts/bpf_doc.py | rst2man > man7/bpf-helpers.7

Link: <https://lore.kernel.org/linux-man/CA+FoirA-FeYeA5ZPgCvo55Hg_dfe7dT54Co8CkU9wW8yemFcJA@mail.gmail.com/T/>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Quentin Monnet <quentin.monnet@netronome.com>
Cc: Rumen Telbizov <rumen.telbizov@menlosecurity.com>
Signed-off-by: Alejandro Colomar <alx.manpages@gmail.com>