docs: useFetch uses isomorphic $fetch

docs/content/2.guide/2.features/5.data-fetching.md

@@ -184,7 +184,7 @@ When we call `fetch` in the browser, user headers like `cookie` will be directly
 
 We can use [`useRequestHeaders`](/api/composables/use-request-headers) to access and proxy cookies to the API from server-side.
 
-The example below adds the request headers to an isomorphic `fetch` call to ensure that the API endpoint has access to the same `cookie` header originally sent by the user.
+The example below adds the request headers to an isomorphic `$fetch` call to ensure that the API endpoint has access to the same `cookie` header originally sent by the user.
 
 ```vue
 <script setup>