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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7889fcb0697b by Martin Panter in branch '3.5':
Issue #26535: Correct docs regarding the struct buffer size
https://hg.python.org/cpython/rev/7889fcb0697b

New changeset 39dc2f39373d by Martin Panter in branch 'default':
Issue #26535: Merge struct doc from 3.5
https://hg.python.org/cpython/rev/39dc2f39373d

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nosy: +python-dev

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