[InterNetNews/inn] 16fee2: Improve documentation of additional overview fields

[Julien ÉLIE]

  Branch: refs/heads/2.7
  Home:   https://github.com/InterNetNews/inn
  Commit: 16fee21a38d75046ad54c08d8e109eb0a6b5a2bb
      https://github.com/InterNetNews/inn/commit/16fee21a38d75046ad54c08d8e109eb0a6b5a2bb
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-08-04 (Thu, 04 Aug 2022)

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

  Log Message:
  -----------
  Improve documentation of additional overview fields

Mention a use case (news reader scoring with Path and Newsgroups)
and improve the wording.