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

[Cheryl Sabella]

Cheryl Sabella <cheryl.sabella at gmail.com> added the comment:

@RadicalZephyr, are you interested in making a GitHub pull request with the recommended the documentation change?

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nosy: +cheryl.sabella
versions: +Python 3.7, Python 3.8 -Python 2.7, Python 3.4, Python 3.5, Python 3.6

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