[docs] [issue33804] Document the default value of the size parameter of io.TextIOBase.read

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

What about other methods and other classes?

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nosy: +benjamin.peterson, serhiy.storchaka, stutzbach

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<https://bugs.python.org/issue33804>
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