feat(onboarding): add comments to snippets

[Tymek]

About the changes

Add warning about plaintext API key and increased metrics interval

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Name	Status	Preview	Comments	Updated (UTC)
unleash-monorepo-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 3, 2024 3:40pm

1 Skipped Deployment

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **unleash-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/unleash-team/unleash-docs/4j3W1iWNvFaPAHbXhd1vdUPtZcK2)) | | | Oct 3, 2024 3:40pm |

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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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