Bug#926245: Clarify that netinst can indeed still install without net

[積丹尼 Dan Jacobson <jidanni@jidanni.org>]

X-Debbugs-Cc: ben@decadent.org.uk
Package: cdimage.debian.org
Severity: minor

On e.g.,
http://cdimage.debian.org/cdimage/unofficial/non-free/cd-including-firmware/current/amd64/iso-cd/

At

   What is a netinst image?

   The netinst CD here is a small CD image that contains just the core
   Debian installer code and a small core set of text-mode programs (known
   as "standard" in Debian). To install a desktop or other common software,
   you'll also need either an Internet connection or some other Debian
   CD/DVD images.

Perhaps add something like:

   Without them you will only end up with very minimal, but yes indeed
   still working, Debian system.

Based on https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=926149#38

Thanks.