Adds USPs to chat docs

[franrob-projects]

This PR:

• Is in draft until I PR everything

Checklist

• Commits have been rebased.
• Linting has been run against the changed file(s).
• The PR adheres to the writing style guide and contribution guide.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch FTF-315-write-usp-copy-for-chat

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