docs: add documentation for frontmatter availability feature #3442
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Summary
Documents the new frontmatter availability feature from fern-api/fern#12022. This feature allows users to set page availability directly in frontmatter, which overrides any availability defined in the navigation (
docs.yml).Changes:
availabilitysection to the frontmatter documentation page (fern/products/docs/pages/customization/frontmatter.mdx)fern/products/docs/pages/changelog/2026-02-03.mdx)Review & Testing Checklist for Human
stable,generally-available,in-development,pre-release,deprecated,beta/learn/docs/customization/frontmatter#availabilityresolves correctly in the previewSuggested test plan: Review the preview deployment and navigate to both the frontmatter page and changelog to verify the new content renders correctly and links work.
Notes
Link to Devin run: https://app.devin.ai/sessions/9d16c76cb1a2468999aef2e8ed1a086c
Requested by: Fern Support