PEP 649 Cleaning up a bit of formatting.

[PythonCHB]

one code-block added, and a couple places where URLs were formatted at quotations.

no changes to the text.

I signed the CLA years ago :-)

[the-knights-who-say-ni]

Hello, and thanks for your contribution!

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@PythonCHB

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[PythonCHB]

NOTE: I didn't have this gitHub ID associated with the BPO -- I've now rectified that, so you should have the CLA