[docs] [issue37134] Use PEP570 syntax in the documentation

[Carol Willing]

Carol Willing <willingc at gmail.com> added the comment:

@brian, Just to echo Brett's words, the Steering Council appreciated the tabbed prototype and your effort to create it. While we may not use it in this particular case, it's great to keep in mind for other places. Thanks for contributing :D

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<https://bugs.python.org/issue37134>
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