Patch for packaging guide

[Jordan Mantha]

Dmitri A. Alenitchev wrote:
> Hello.
> 
> I found little mistake in packaging guide. 
> 
> "...the Ubuntu version is 0 (e.g., 2.1.1-0ubuntu1)"
> In 2.1.1-0ubuntu1 Ubuntu version is 1 (ubuntu1), but
> Debian version is 0.
> I think, must be:
> "...the Debian version is 0 (e.g., 2.1.1-0ubuntu1)"
> 

Thanks for catching that, I've applied it in rev. 3183 . Don't hesitate
to send further patches. Any help is welcome.

-Jordan Mantha