[docs] [issue35042] Use the role :pep: for the PEP \d+

[Srinivas Reddy Thatiparthy(శ్రీనివాస్ రెడ్డి తాటిపర్తి)]

Srinivas  Reddy Thatiparthy(శ్రీనివాస్ రెడ్డి తాటిపర్తి) <thatiparthysreenivas at gmail.com> added the comment:

This gives us the hyperlink everywhere a PEP is referenced?

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nosy: +thatiparthy

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35042>
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