Clarify how s_client -ign_eof and -quiet impact command processing

Clarify how s_client -ign_eof and -quiet impact command processing

If -ign_eof -or -quiet are passed to s_client this implicitly turns off
command processing (i.e. equivalent to -nocommands). This was stated on
the man page in the "CONNECTED COMMANDS" section, but not in the
documentation for "-ign_eof" or "-quiet" directly. We state it here as
well to make it clearer.

Fixes #27443

Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/27500)