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

[miss-islington]

miss-islington <mariatta.wijaya+miss-islington at gmail.com> added the comment:


New changeset 770937b6fd87af91390ac765f6a4c4767432cbc3 by Miss Islington (bot) in branch '3.6':
bpo-33804: Document that the argument for io.TextIOBase.read() is optional (GH-7510)
https://github.com/python/cpython/commit/770937b6fd87af91390ac765f6a4c4767432cbc3


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