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

[Roundup Robot]

Roundup Robot <devnull at psf.upfronthosting.co.za> added the comment:

New changeset c316e8a4a5e2 by Larry Hastings in branch 'default':
Merge: Propagate changes for issues #13053 and #13086 from 2.7 to 3.2.
http://hg.python.org/cpython/rev/c316e8a4a5e2

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