docs: fix code example

Author: atinux

docs/content/1.guide/3.API.md

@@ -113,6 +113,6 @@ Theme tokens gets processed by [Style Dictionary](https://amzn.github.io/style-d
   import { $dt } from '#design-tokens'
 
   export default defineHandler(() => {
-    return $tokens('colors.base')
+    return $dt('colors.base')
   })
   ```