[docs] [issue29933] asyncio: set_write_buffer_limits() doc doesn't specify unit of the parameters

[Mariatta Wijaya]

Changes by Mariatta Wijaya <mariatta.wijaya at gmail.com>:


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versions: +Python 3.5, Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29933>
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