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

[Roundup Robot]

Roundup Robot added the comment:

New changeset c83ce2a1841c by Brett Cannon in branch 'default':
null merge for issue #20812
http://hg.python.org/cpython/rev/c83ce2a1841c

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<http://bugs.python.org/issue20812>
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