[issue20696] asyncio.docs: Document StreamReader an other streams module APIs

[Roundup Robot]

Roundup Robot added the comment:

New changeset dc8331171f14 by Yury Selivanov in branch '3.4':
asyncio.docs: Improve documentation of Streams. Issue #20696.
http://hg.python.org/cpython/rev/dc8331171f14

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<http://bugs.python.org/issue20696>
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