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

[Roundup Robot]

Roundup Robot added the comment:

New changeset 80b1c5b25ff0 by Terry Jan Reedy in branch '2.7':
Issue #18315: Improve fileinput docs by adding 'bufsize' where missing and
http://hg.python.org/cpython/rev/80b1c5b25ff0

New changeset 0760b58526ba by Terry Jan Reedy in branch '3.3':
Issue #18315: Improve fileinput docs by adding 'bufsize' where missing and
http://hg.python.org/cpython/rev/0760b58526ba

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nosy: +python-dev

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