[docs] [issue26535] Minor typo in the docs for struct.unpack

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

LGTM.

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assignee: docs at python -> martin.panter
stage: patch review -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26535>
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