Some patches (minor changes)

[Waldir Pimenta]

Hi all,
I came across arbtt some months ago but never took the time to set to set
it up properly.
In the process of learning how to work with it, I decided I should use the
opportunity to learn how to use darcs and hopefully improve arbtt upstream,
even if just documentation-wise.
So here are a few minor changes, hopefully in a properly formatted way.

Cheers,
Waldir
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