[docs] [issue37480] add ptpython to list of alternate interpreters

[Zach Valenta]

Change by Zach Valenta <zjv5002 at gmail.com>:


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keywords: +patch
pull_requests: +14351
stage:  -> patch review
pull_request: https://github.com/python/cpython/pull/14538

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37480>
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