change reusable snippet page link and add redirect

Author: devalog

fern/docs.yml

@@ -402,7 +402,10 @@ redirects:
     destination: /learn/docs/customization/frontmatter
     permanent: true
   - source: /learn/docs/content/reusable-snippets
-    destination: /learn/docs/writing-content/reusable-markdown
+    destination: /learn/docs/writing-content/reusable-snippets
+    permanent: true
+  - source: /learn/docs/writing-content/reusable-markdown
+    destination: /learn/docs/writing-content/reusable-snippets
     permanent: true
   - source: /learn/docs/content/changelog
     destination: /learn/docs/navigation/changelogs

fern/products/cli-api-reference/cli-changelog/2025-09-22.mdx

@@ -7,7 +7,7 @@
 
 
 ## 0.78.4
-**`(fix):`** Collapse any combination of optional and nullable to optional<nullable<T>>.
+**`(fix):`** Collapse any combination of optional and nullable to `optional<nullable<T>>`.
 
 ## 0.78.3
 **`(chore):`** Support IR v59 in the Rust SDK generator.

fern/products/docs/docs.yml

@@ -100,7 +100,6 @@ navigation:
         slug: fern-editor
       - page: Reusable snippets
         path: ./pages/component-library/custom-components/reusable-markdown.mdx
-        slug: reusable-markdown
       - page: Custom React components
         path: ./pages/component-library/custom-components/custom-react-components.mdx
       - page: Conditionally rendered content