[docs] [issue21860] Correct FileIO docstrings

[Roundup Robot]

Roundup Robot added the comment:

New changeset be2746c565c2 by Berker Peksag in branch '2.7':
Issue #21860: Correct docstrings of FileIO.seek() and FileIO.truncate() methods.
https://hg.python.org/cpython/rev/be2746c565c2

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21860>
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