[CMake] Minor documentation mistake

[Cutberto Escamilla]

Hello,

I was trying to use the Graphviz feature on CMake and noticed a mistake on
the documentation where it says to use "--graphiz=foo" instead of
"--graphviz=foo" where the former doesn't work but the latter does.

I tried searching the different archives, but there is no mention about
this. Was wondering if I should submit a bug.

Thanks,
Juan Escamilla
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