[issue21332] subprocess bufsize=1 docs are misleading

[akira]

akira added the comment:

I've updated the patch to remove changes to test_universal_newlines 
test that was fixed in revision 37d0c41ed8ad that closes #21396 issue

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Added file: http://bugs.python.org/file35189/subprocess-line-buffering-issue21332-ps4.patch

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