docs: clarify api-name is only for multiple APIs

[devin-ai-integration]

Summary

Updates the api-name property description in the API Reference configuration table to clarify that it can't be used with a single API. This addresses confusion where users with a single API reference try to use api-name and encounter an error.

Before: "Name of the API you're referencing, if there are multiple APIs"

After: "Name of the API you're referencing. Required when you have multiple APIs, but can't be used with a single API."

Review & Testing Checklist for Human

• Verify the documentation accurately reflects CLI behavior - test that using api-name with a single API actually produces an error
• Confirm the wording is clear and helpful for self-serve users

Notes

Requested by kenny

Link to Devin run: https://app.devin.ai/sessions/8509e6be62b24fe1ade2e775879c325a

[devin-ai-integration]

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[github-actions]

🚫 [vale] _{reported by reviewdog 🐶}
[Microsoft.Contractions] Use 'can't' instead of 'cannot'.

[github-actions]

🌿 Preview your docs: https://fern-preview-be43b9ef-f38b-42eb-81bc-d7d82c84843c.docs.buildwithfern.com/learn

Here are the markdown pages you've updated:

• learn/docs/api-references/generate-api-ref

[github-actions]

🌿 Preview your docs: https://fern-preview-62c1dcfb-f98e-4c9b-b258-4569b88dbd1e.docs.buildwithfern.com/learn

Here are the markdown pages you've updated:

• learn/docs/api-references/generate-api-ref