PEP 694: fix unreferenced footnote

[Secrus]

• 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)

Ref: #4087

I have decided to remove the unreferenced footnote. Given the content, it didn't make sense to leave it as a bare reference.

[read-the-docs-community]

Documentation build overview

📚 pep-previews | 🛠️ Build #33684106 | 📁 Comparing d8595e4 against latest (d2259e1)

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± pep-0694/index.html

[warsaw]

Thanks!