[Patch, committed] Fix spelling of cannot in config/ directory

[Florian Weimer]

* Andrew Haley:

>  > Yes but they do not mean the same thing, see
>  > <http://www.languagehat.com/archives/000876.php>.
>
> He's entitled to his opinion, but Webster, Chambers, and the OED say
> he's wrong.

Are you sure about the OED?  The most recent paper edition has the
following entry:

| CANNOT, the ordinary modern way of writing "can not"

The article on "can" mentions only "cannot", not "can not" as the
negative form.