[MERGE] Add --custom to Version Info in User Guide

[Neil Martinsen-Burrell]

Ian Clatworthy <ian.clatworthy <at> internode.on.net> writes:

> Comment:
> I'm not sure if Windows command line quoting can handle the escaped 
> backslashes. You might want to explicitly check that on IRC with someone 
> running Windows. If it doesn't work, at we minimum we need to say "on 
> Unix" when introducing the example.

It worked for me in a Windows XP VM under Parallels, so I guess it does work. 
Go Windows shell!  (If it hadn't worked, we also should have changed the help
for ``version-info`` because that's where I stole the example from.)

Peace,

-Neil