[InterNetNews/inn] 965090: Typos "then" -> "than"

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 965090db60cfab5050d87492de259bb2509ef067
      https://github.com/InterNetNews/inn/commit/965090db60cfab5050d87492de259bb2509ef067
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2021-12-19 (Sun, 19 Dec 2021)

  Changed paths:
    M contrib/pullart.c
    M doc/pod/expire.pod
    M doc/pod/newsfeeds.pod
    M expire/expire.c
    M frontends/encode.c
    M frontends/sys2nf.c
    M scripts/innreport.in
    M storage/expire.c

  Log Message:
  -----------
  Typos "then" -> "than"