[plt-scheme] Thread documentation

It would be great if you could add one of the following two paragraphs to
the PLT Scheme Reference section 1.1.13.

1.  PLT Scheme supports true native / OS threads meaning that multiple core
CPU's are fully taken advantage of.

-or-

2.  PLT Scheme simulates threads within scheme in an OS portable way.  All
scheme threads run within one (or a small or limited number) of OS threads.
Multi-core CPU's are therefore not fully utilized.


Many Scheme's and Lisp's out there say they support threads but how they do
this (cooperative/pre-emptive, native/simulated) makes all the difference in
the world.  Sadly, virtually no one's documentation makes it clear what you
are dealing with.  Adding the above text would clarify the matter.

Thanks.

Blake McBride
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