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

[Pablo Galindo Salgado]

Change by Pablo Galindo Salgado <pablogsal at gmail.com>:


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keywords: +patch
pull_requests: +13626
stage: needs patch -> patch review
pull_request: https://github.com/python/cpython/pull/13743

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