[issue26897] [doc] Clarify Popen stdin, stdout, stderr

[Kumar Aditya]

Change by Kumar Aditya <rahuladitya303 at gmail.com>:


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keywords: +patch
nosy: +kumaraditya303
nosy_count: 3.0 -> 4.0
pull_requests: +28459
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/30231

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26897>
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