[InterNetNews/inn] c0110b: Better document the "server" parameter in inn.conf

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: c0110bbdca3e9ccaf4651a481963d9edef087bfa
      https://github.com/InterNetNews/inn/commit/c0110bbdca3e9ccaf4651a481963d9edef087bfa
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2023-04-14 (Fri, 14 Apr 2023)

  Changed paths:
    M doc/pod/inews.pod
    M doc/pod/inn.conf.pod
    M doc/pod/rnews.pod

  Log Message:
  -----------
  Better document the "server" parameter in inn.conf

inews uses the "server" parameter.

rnews uses that parameter when nnrpdposthost is not set, and there's no
server at localhost.