[docs] [issue21860] Correct FileIO docstrings

[Roundup Robot]

Roundup Robot added the comment:

New changeset 2058d94f32dd by Berker Peksag in branch '3.4':
Issue #21860: Correct docstrings of FileIO.seek() and FileIO.truncate() methods.
https://hg.python.org/cpython/rev/2058d94f32dd

New changeset de645efe6a9b by Berker Peksag in branch 'default':
Issue #21860: Correct docstrings of FileIO.seek() and FileIO.truncate() methods.
https://hg.python.org/cpython/rev/de645efe6a9b

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nosy: +python-dev

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<http://bugs.python.org/issue21860>
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