[docs] [issue1643712] Emphasize buffering issues when sys.stdin is used

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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assignee:  -> docs at python
keywords: +patch
nosy: +docs at python
stage: unit test needed -> 
versions: +Python 2.7, Python 3.1, Python 3.2 -Python 3.0

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1643712>
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