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

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). ---------- _______________________________________ Python tracker <report@bugs.python.org> <http://bugs.python.org/issue17003> _______________________________________