[issue20813] Backport revised 2to3 guide to older branches

[Roundup Robot]

Roundup Robot added the comment:

New changeset a24085e1b1f5 by Brett Cannon in branch '3.3':
Issue #20813: Backport Python 2/3 HOWTO updates
http://hg.python.org/cpython/rev/a24085e1b1f5

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nosy: +python-dev

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20813>
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