Document default-language configuration option in API reference setup guide

[emrgnt-cmplxty]

Documentation Page URL

https://github.com/cohere-ai/cohere-developer-experience/blob/72ae51169c2cc288139e78890d9ac502c9def401/fern/docs.yml#L14

Issue Description

Description

Currently, the ability to configure the default programming language shown in the API reference (via default-language in docs.yml) is not documented. This setting is important for teams who want to customize the initial SDK example language their users see.

Current Status

• The configuration option exists and works (default-language: python in docs.yml)
• This functionality is not mentioned in our documentation

Proposed Changes

Add documentation explaining:

• Where to set the default language (docs.yml)
• Available language options
• Example configuration
• Default value if not specified

Example Documentation Section

## Configuring Default SDK Language

You can specify which programming language's SDK examples are shown by default in the API reference by setting `default-language` in your `docs.yml`:

```yaml
default-language: python

Available options include:

• python
• curl
• [other supported languages]

## Labels
- documentation
- enhancement

### Steps to Reproduce (Optional)

_No response_

### Suggested Improvement

_No response_

[dannysheridan]

Relevant docs page: https://buildwithfern.com/learn/docs/getting-started/global-configuration