update treatUnknownAsAny

Author: devalog

fern/products/sdks/pages/typescript/configuration.mdx

@@ -99,7 +99,7 @@ config:
 </ParamField>
 
 <ParamField path="treatUnknownAsAny" type="boolean" default="false">
-  In Fern, there's an `unknown` type that represents data that isn't knowable at runtime. When `treatUnknownAsAny` is enabled, unknown types from Fern are generated into TypeScript using `any` instead of the `unknown` type.
+  When `treatUnknownAsAny` is enabled, [unknown types from Fern are generated into TypeScript using `any` instead of the `unknown` type](https://www.typescriptlang.org/docs/handbook/release-notes/typescript-3-0.html#new-unknown-top-type).
 </ParamField>
 
 <ParamField path="noOptionalProperties" type="boolean" default="false">