[AD] clip3d_f docs are incorrect

[Bob <ohannessian@xxxxxxxxxx>]

This has been discussed before, but the documentations haven't been
updated. For details, I've posted up what Ben Davis had said on the
subject at the time as I feel his descripttion is mostly correct.
http://www.allegro.cc/ubb-bin/ultimatebb.cgi?ubb=get_topic&f=1&t=001795

And here's the proposed patch:

--
- Robert J Ohannessian
"Microsoft code is probably O(n^20)" (my CS prof)
http://pages.infinit.net/voidstar/

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