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

[STINNER Victor]

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


New changeset cdb2dbfe92b95dcd19ccab1a1e9b8c39263c54b0 by Victor Stinner (Geoff Shannon) in branch '3.7':
[3.7] bpo-22865: Expand on documentation for the pty.spawn function (GH-11980) (GH-13455)
https://github.com/python/cpython/commit/cdb2dbfe92b95dcd19ccab1a1e9b8c39263c54b0


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<https://bugs.python.org/issue22865>
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