[docs] [issue29068] Fix example code for PyErr_Fetch

[Roundup Robot]

Roundup Robot added the comment:

New changeset 34e7b9879e60 by Serhiy Storchaka in branch '3.5':
Issue #29068: Fixed a typo in PyErr_Fetch example.
https://hg.python.org/cpython/rev/34e7b9879e60

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nosy: +python-dev

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