docs: add documentation for edit-this-page launch property

[devin-ai-integration]

docs: add documentation for edit-this-page launch property

Summary

Adds documentation for the previously undocumented launch property on the edit-this-page configuration. This property (added in CLI v3.47.0) controls where the "Edit this page" link directs users — when set to dashboard, it opens the Fern dashboard editor instead of linking to GitHub.

Changes:

• API definition (fern/apis/docs-yml/definition/docs.yml): Added launch field to EditThisPageConfig with a new EditThisPageLaunchTarget enum (github | dashboard)
• Site-level settings page (site-level-settings.mdx): Added a ParamField for launch, added launch: dashboard to the existing Single Instance example in the GitHub configuration section, and updated the edit-this-page summary to mention the launch option

Updates since last revision

• Fixed MDX parsing error: replaced escaped double quotes (\"github\") with single quotes ('github') in the ParamField type attribute, matching the existing convention used elsewhere in the file (e.g. 'filename' | 'frontmatter').
• Consolidated the launch: dashboard example into the existing GitHub configuration "Single Instance" tab instead of having a separate example section.

Review & Testing Checklist for Human

• Verify the feature description is accurate: The behavior ("opens the page in the Fern dashboard editor") was inferred from the CLI changelog and Fern's own docs.yml usage — confirm this matches the actual runtime behavior
• Confirm launch is correctly placed as a sibling of github in the EditThisPageConfig type (not nested inside GithubEditThisPageConfig). This matches Fern's own docs.yml but should be verified against the CLI parser
• Check the rendered docs page to ensure the new ParamField and inline example display correctly under the GitHub configuration section

Suggested test plan: Deploy a preview and navigate to the site-level settings page → GitHub configuration section. Verify the launch ParamField renders correctly and that launch: dashboard appears in the Single Instance YAML example.

Notes

• Link to Devin run
• Requested by: Fern Support

[devin-ai-integration]

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[fern-api]

Requested by: ryan stephen
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[github-actions]

🌿 Preview your docs: https://fern-preview-ed643938-392a-4a75-be14-1db74faa4d29.docs.buildwithfern.com/learn

Here are the markdown pages you've updated:

• learn/docs/configuration/site-level-settings