fix-docs: TS error when importing a function as a type only (example logged in user middleware) (#7073)

www/apps/docs/content/development/api-routes/example-logged-in-user.mdx

@@ -23,11 +23,11 @@ Learn more about [middlewares in its guide](./add-middleware.mdx).
 Create the file `src/api/middlewares.ts` with the following content:
 
 ```ts title="src/api/middlewares.ts"
-import type { 
+import { 
   authenticate,
-  MiddlewaresConfig, 
+  type MiddlewaresConfig, 
-  User, 
+  type User, 
-  UserService,
+  type UserService,
 } from "@medusajs/medusa"
 import type { 
   MedusaNextFunction,