[InterNetNews/inn] 86c016: Fix documentation of virtualhost in readers.conf

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 86c0167aa7ee3cb45ab9f4adcab22d9e0fcd247a
      https://github.com/InterNetNews/inn/commit/86c0167aa7ee3cb45ab9f4adcab22d9e0fcd247a
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2022-07-08 (Fri, 08 Jul 2022)

  Changed paths:
    M doc/pod/nnrpd.pod
    M doc/pod/readers.conf.pod

  Log Message:
  -----------
  Fix documentation of virtualhost in readers.conf

Also document the use of virtualhost with "nnrpd -I instance".