[issue29068] Fix example code for PyErr_Fetch

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM. Thank you for your contribution Chi Hsuan Yen.

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assignee: docs at python -> serhiy.storchaka
stage:  -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29068>
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