[issue20812] Explicitly cover application migration in the 2->3 guide

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2a922153463e by Brett Cannon in branch 'default':
Issue #20812: Add a short opener to the Python 2/3 porting HOWTO.
http://hg.python.org/cpython/rev/2a922153463e

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nosy: +python-dev

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