reference configuration file format from the --config=FILE section in the manpage

[Karl-Philipp Richter]

It's extraordinarily hard to figure out how configuration files need to look like. This should be improved by referencing the format (section in the manpage, link to web resource, etc.) in the `--config=FILE` section of the manpage.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: dyndns 2014.0708-1
Uname: Linux 4.0.0-040000-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.14.7-0ubuntu8.4
Architecture: amd64
Date: Tue Apr 21 15:49:08 2015
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-20 (0 days ago)
InstallationMedia: Ubuntu-Server 14.10 "Utopic Unicorn" - Release amd64 (20141022.2)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: dyndns
UpgradeStatus: No upgrade log present (probably fresh install)

[Jari Aalto (jari-aalto)]

This bug can be closed.

In OPTIONS where --config is described, it clearly states:

  (...) See section CONFIGURATION FILE for more information how to write the
  files.

And in section "CONFIGURATION FILE" there is complete exaple of the configuration file.