[issue13086] Update howto/cporting.rst so it talks about Python 3 instead of 3.0

[Larry Hastings]

Larry Hastings <larry at hastings.org> added the comment:

@eric.araujo: I talked to Brett about it.  We don't pretend that Python 3.0 never existed; we tell people it's unsupported and unsuitable for production use.  At his suggestion I added a statement to that effect, and left the rest the same.

I'll now manually incorporate this into the 3.2 branch, then forward-port to trunk.

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