[docs] [issue18315] Fix fileinput doc and docstrings (add 'buffer' in 2.7)

[Terry J. Reedy]

Terry J. Reedy added the comment:

There was one missing 'bufsize' in 3.x also.

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resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18315>
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