PEP 770: Add sections for Users, Projects, and SCA tools in 'How to Teach'

[sethmlarson]

• Change is either:
  • To a Draft PEP
  • To an Accepted or Final PEP, with Steering Council approval
  • To fix an editorial issue (markup, typo, link, header, etc)
• PR title prefixed with PEP number (e.g. PEP 123: Summary of changes)

---

📚 Documentation preview 📚: https://pep-previews--4222.org.readthedocs.build/

[sethmlarson]

Thanks for the reviwew @AA-Turner, I addressed your changes in cd7a24a.