add reference to quickstart

Author: devalog

fern/products/sdks/snippets/initialize-fern-folder-intro.mdx

@@ -1,5 +1,5 @@
 You can initialize your fern folder with either a Fern Definition or OpenAPI specification.
 
   <Tip>
-    You can always convert a Fern Definition to OpenAPI or OpenAPI to a Fern Definition later on.
+    You can always convert a [Fern Definition to OpenAPI](/api-definitions/ferndef/export-openapi) or OpenAPI to a Fern Definition later on.
   </Tip>