Update migration doc with fallback token permissions

[oredavids]

Outdated token images are not replaced because the data is now displayed across multiple UI views in GitHub. In the case of the admin token; we would need 3 diffrent images so they no longer seem to provide as much value as a single image did.

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ready	Preview	Comment	Oct 10, 2025 5:43pm

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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 update-token-permissions

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