Remove the PROTOCOLS section from the source files completely and
instead generate them based on the header data in the curldown files.
It also generates TLS backend information for options marked for TLS as
protocol.
Closes#13175
The mandatory header now has a mandatory list of protocols for which the
manpage is relevant.
Most man pages already has a "PROTOCOLS" section, but this introduces a
stricter way to specify the relevant protocols.
cd2nroff verifies that at least one protocol is mentioned (which can be
`*`).
This information is not used just yet, but A) the PROTOCOLS section can
now instead get generated and get a unified wording across all manpages
and B) this allows us to more reliably filter/search for protocol
specific manpages/options.
Closes#13166
The curldown conversion accidentally replaced daniel@haxx.se with
just daniel.se. This reverts back to the proper email address in
the curldown docs as well as in a few other stray places where it
was incorrect (while unrelated to curldown).
Reviewed-by: Daniel Stenberg <daniel@haxx.se>
Closes: #12997
