[racket] How to provide module bindings required with for-doc

There's no `(provide (for-doc ...))`, so far. I don't yet know how to
make it work, but the problem is at least on my radar.

At Fri, 10 Jan 2014 17:43:03 -0800, Scott Klarenbach wrote:
> How can one file provide the bindings it required using the for-doc subform
> to other modules that wish to require it, so that those modules don't have
> to perform the (require (for-doc...) ...) themselves?
> 
> I think it's something to do with for-meta and phase level shifting but I'm
> a bit foggy on the details.
> 
> Thanks.
> 
> -- 
> Talk to you soon,
> 
> Scott Klarenbach
> 
> PointyHat Software Corp.
> www.pointyhat.ca
> p 604-568-4280
> e scott at pointyhat.ca
> 200-1575 W. Georgia
> Vancouver, BC V6G2V3
> 
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