[issue16657] traceback.format_tb incorrect docsting

[Roundup Robot]

Roundup Robot added the comment:

New changeset dcded8c7af89 by Georg Brandl in branch '3.3':
Closes #16657: fix docstring of traceback.format_tb().
http://hg.python.org/cpython/rev/dcded8c7af89

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<http://bugs.python.org/issue16657>
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