Fix broken links and typo, Pinto::Manual::Tutorial.

I suspect from the context that you meant cpanm, rather than cpnam.
No hard feelings if I got that wrong, in which case take this
as a bug report that you have broken links in that pod,
which you probably want to address.

Thanks for your work on this.  This looks like a very useful tool.
One I only just today discovered (thanks to Perl Maven TV) and am
already thinking of integrating into my own work and pitching at
the office for others consideration.