doc: Syntax highlighting

Author: franky47

packages/docs/content/docs/server-side.mdx

@@ -7,7 +7,7 @@ description: Type-safe search params on the server
 
 To parse search params server-side, you can use a _loader_ function.
 
-You create one using the `createLoader` function, by passing it your search params
+You create one using the `createLoader{:ts}` function, by passing it your search params
 descriptor object:
 
 ```tsx title="searchParams.tsx"