[docs] [issue17003] Unification of read() and readline() argument names

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Looks as size is most common parameter name for both read() and readline(). First, we can change the io documentation and _pyio signatures (it shouldn't break anything because _io doesn't support keyword arguments).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17003>
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