Minor updates to HACKING

[Christian Stimming]

Am Dienstag, 8. September 2009 22:40 schrieb Geert Janssens:
> I have updated HACKING to reflect these changes, together with a small
> typo.
>
> Attached is a patch for it.

Applied to SVN, thanks a lot.

(As for the svn:ignore property: I don't even have any svn working copy 
anymore, because I use git-svn all the time, so I can't apply those...)

Regards,

Christian