[docs] [issue18315] bufsize parameter not documented in 2.7.5

[R. David Murray]

R. David Murray added the comment:

A quick look at the VCS history indicates bufsize has been in there for a long time.  The sphinx docs are wrong as well.  This is correctly documented in python3, apparently as part of the conversion from [] notation to keyword notation in d143eb624cf5.

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nosy: +r.david.murray

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