docs: add note about useFetch auto generated key (#7044)

docs/content/3.api/1.composables/use-fetch.md

@@ -44,7 +44,7 @@ type AsyncData<DataT> = {
   * `headers`: Request headers.
   * `baseURL`: Base URL for the request.
 * **Options (from `useAsyncData`)**:
-  * `key`: a unique key to ensure that data fetching can be properly de-duplicated across requests, if not provided, it will be generated based on the `url` and fetch options.
+  * `key`: a unique key to ensure that data fetching can be properly de-duplicated across requests, if not provided, it will be generated based on the static code location where `useAyncData` is used.
   * `lazy`: Whether to resolve the async function after loading the route, instead of blocking navigation (defaults to `false`).
   * `server`: Whether to fetch the data on the server (defaults to `true`).
   * `default`: A factory function to set the default value of the data, before the async function resolves - particularly useful with the `lazy: true` option.