Debian's QA tool “lintian” reported a bad whatis entry for the
xorg.conf(.d) manpages.

It comes with the following pointers:
  For manual pages that document multiple programs, functions, files, or
  other things, the part before "\-" should list each separated by a
  comma and a space. […]

  Refer to the lexgrog(1) manual page, the groff_man(7) manual page, and
  the groff_mdoc(7) manual page for details.

Indeed, the current situation is:
  $ whatis xorg.conf; whatis xorg.conf.d
  xorg.conf (5)        - (unknown subject)
  xorg.conf.d (5)      - (unknown subject)

With this patch:
  xorg.conf (5)        - configuration files for Xorg X server
  xorg.conf.d (5)      - configuration files for Xorg X server

Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Cyril Brulebois <kibi@debian.org>