[docs] [issue23983] Update example in the pty documentation

[Roundup Robot]

Roundup Robot added the comment:

New changeset e656bece13fa by Berker Peksag in branch '3.4':
Issue #23983: Update the pty module example.
https://hg.python.org/cpython/rev/e656bece13fa

New changeset 0be7c8f46378 by Berker Peksag in branch 'default':
Issue #23983: Update the pty module example.
https://hg.python.org/cpython/rev/0be7c8f46378

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<http://bugs.python.org/issue23983>
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