[docs] [issue22865] Document how to make pty.spawn not copy data

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Thanks Geoff Shannon for the doc enhancement!

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue22865>
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