Summary

Found these while experimenting with the categorisation:

• Use canonical PEP URLs (https://peps.python.org/ instead of https://www.python.org/dev/)
• Provide a title to PEP references:
  • If the URL links to the full PEP, then use PEP [code] - [page title]
  • If the URL links to a specific section, then use PEP [code]: [section title]
• Add references to the Python documentation in a few places.
• Ensure that titles to the Python documentation are consistent.
• Fix links to Typing documentation (page was moved).
• Various small extensions to examples.