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docs: extend description of handler for useAsyncData (#23389)

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docs/3.api/1.composables/use-async-data.md
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@ -51,7 +51,7 @@ type AsyncDataRequestStatus = 'idle' | 'pending' | 'success' | 'error'
## Params
* **key**: a unique key to ensure that data fetching can be properly de-duplicated across requests. If you do not provide a key, then a key that is unique to the file name and line number of the instance of [`useAsyncData`](/docs/api/composables/use-async-data) will be generated for you.
* **handler**: an asynchronous function that returns a value
* **handler**: an asynchronous function that must return a truthy value (for example, it should not be `undefined` or `null`) or the request may be duplicated on the client side
* **options**:
* _server_: whether to fetch the data on the server (defaults to `true`)
* _lazy_: whether to resolve the async function after loading the route, instead of blocking client-side navigation (defaults to `false`)