docs: remove duplicate entry for default option (#4519)

delete the duplicated `default` parameter description.

docs/content/3.api/1.composables/use-async-data.md

@@ -41,7 +41,6 @@ type DataT = {
   * _pick_: only pick specified keys in this array from the `handler` function result
   * _watch_: watch reactive sources to auto-refresh
   * _initialCache_: When set to `false`, will skip payload cache for initial fetch. (defaults to `true`)
-  * _default_: A function that returns the default value (before the handler function returns its value).
 
 Under the hood, `lazy: false` uses `<Suspense>` to block the loading of the route before the data has been fetched. Consider using `lazy: true` and implementing a loading state instead for a snappier user experience.