[InterNetNews/inn] 1b8b13: Update wording about innmail and the configured MTA

[Julien ÉLIE]

  Branch: refs/heads/2.7
  Home:   https://github.com/InterNetNews/inn
  Commit: 1b8b13967412b04ab76e3516faeb77f462104661
      https://github.com/InterNetNews/inn/commit/1b8b13967412b04ab76e3516faeb77f462104661
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-01-24 (Tue, 24 Jan 2023)

  Changed paths:
    M doc/FAQ
    M doc/pod/inn.conf.pod
    M doc/pod/innmail.pod
    M doc/pod/news2mail.pod
    M include/inn/innconf.h

  Log Message:
  -----------
  Update wording about innmail and the configured MTA

innmail is not invoked for mailing reports of control messages.
Be more accurate about the wording of what innmail and the configured
MTA actually do.