docs/91823: fix typo of reference link

[chinsan]

On 1/15/06, Pav Lucistnik <pav at freebsd.org> wrote:
> > Why need to prepare install floppies, since we have FreeBSD CDROM or
> > DVD? :p
>
> What if we have a CD but can't boot from it?
ok, I understand.:)
Therefore, may this sentence could correct to
"If you have purchased FreeBSD on CD or DVD but your computer  doesn't
allow you to boot from the CDROM or DVD, and should proceed to the
next section"?

Cheers,

-chinsan