Document HTTP snippets enabled by default with configuration options

[devin-ai-integration]

Document HTTP snippets enabled by default with configuration options

Summary

Updated documentation to reflect that HTTP snippets are now enabled by default for all Fern documentation sites. Previously, this feature required internal configuration to activate. Users can now control HTTP snippets behavior directly in their docs.yml file with three options:

1. Default (enabled): All HTTP snippet languages displayed automatically
2. Disabled: Set http-snippets: false to turn off completely
3. Selective: Provide an array like ["python", "ruby"] to show only specific languages

Changes made:

• Updated http-snippets.mdx to replace old setup instructions with new configuration examples
• Updated what-is-docs-yml.mdx to reflect new default value (true instead of false) and type (boolean | array)
• Added changelog entry for 2025-10-17 documenting this change

Review & Testing Checklist for Human

• CRITICAL: Verify HTTP snippets are actually enabled by default in the platform code - this documentation assumes the backend behavior has changed
• Test that the array syntax for language selection works correctly (e.g., http-snippets: [python, ruby])
• Check if there are other documentation pages or examples that reference HTTP snippets configuration and may need updates
• Verify the changelog date (2025-10-17) is appropriate and matches your versioning/release schedule
• Test that internal documentation links resolve correctly, especially /docs/api-references/http-snippets
• Confirm this aligns with the actual product behavior - sites without configuration will now show HTTP snippets by default (potential breaking change for users who expect opt-in behavior)

Notes

• This PR only updates documentation and does not change any platform code
• The old documentation stated users needed a paid subscription and to contact support - this has been removed entirely
• Array syntax examples use valid YAML list format
• Link to Devin session: https://app.devin.ai/sessions/7d40e6f5f6a847b1b6847b6e7bcb7853
• Requested by: Catherine Deskur (catherine@buildwithfern.com)

[devin-ai-integration]

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