docs: add naming configuration for TypeScript SDK

[Swimburger]

docs: add naming configuration for TypeScript SDK

Summary

Adds documentation for the new naming configuration object in the TypeScript SDK generator (corresponding code change: fern-api/fern#13545). This config allows users to independently control the namespace export and PascalCase class/type names (client, error, timeout error, environment, environment URLs, version).

The new <ParamField> block is placed immediately after the existing namespaceExport documentation and includes:

• A YAML + TypeScript example showing lowercase namespace with PascalCase overrides
• A table documenting all 7 optional fields and their defaults
• A note on backwards compatibility with namespaceExport

Review & Testing Checklist for Human

• Verify the import example is accurate: The docs claim namespace: xai produces import { xai, XAiClient } from "xai". Confirm the code PR actually uses the raw namespace value (not PascalCased) as the module-level export name.
• Check rendered table: Confirm the markdown table with 7 fields renders correctly on the preview deployment — markdown tables inside <ParamField> components can sometimes have rendering quirks.
• Vale style check: Verify no Vale style violations are flagged in CI (sentence case, passive voice, etc.).

Test plan: Open the preview deployment, navigate to the TypeScript SDK configuration page, and confirm the new naming section appears between namespaceExport and neverThrowErrors with correct formatting.

Notes

• Companion code PR: feat(typescript): add naming configuration object for independent control of class/type names fern#13545
• Link to Devin session: https://app.devin.ai/sessions/4ba47fb86534412697f8c6063795cd0c
• Requested by: @Swimburger

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[devin-ai-integration]

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

[github-actions]

🌿 Preview your docs: https://fern-preview-2812684e-d5bd-4efa-96c1-fa9091cff026.docs.buildwithfern.com/learn

Here are the markdown pages you've updated:

• learn/sdks/generators/typescript/configuration

[Swimburger]

don't mention xai! use dummy data

[devin-ai-integration]

Fixed — replaced xai with acme in the object form example.