PR 224928 (add information to Virtuaalbox handbook chapter)

[Guido Falsi]

Hi,

I filed bug report 224928 [1] a little while ago.

I noticed that between updates an actually useful paragraph of the
virtualbox chapter was lost.

Is someone willing to review this submission and commit it, or approve
me to commit it? I think it's important to have that information there.

Thanks in advance!

[1] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224928

-- 
Guido Falsi <madpilot at FreeBSD.org>