[nagios-plugins] check_disk: precise the help output (#1170)

Fixing issue #1118
You can merge this Pull Request by running:

  git pull https://github.com/waja/nagios-plugins github1118

Or you can view, comment on it, or merge it online at:

  https://github.com/nagios-plugins/nagios-plugins/pull/1170

-- Commit Summary --

  * check_disk: precise the help output

-- File Changes --

    M plugins/check_disk.c (2)

-- Patch Links --

https://github.com/nagios-plugins/nagios-plugins/pull/1170.patch
https://github.com/nagios-plugins/nagios-plugins/pull/1170.diff

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