Added setup.exe to User's Guide

[Joshua Daniel Franklin]

> > I also added an apostrophe to "Contributor's"
> 
> <pedantry>Should be "Contributors'" IMO (multiple contributors - 
> "intended for _people_")</pedantry>

I thought long and hard about this, and decided that I thought that
it is a Guide for Each Contributor (singular). But, if there is a 
general plurality that it is a Guide for Contributors, I'd be happy
to change it to "Contributors'".

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