Add that enhanced forms can't be async to documentation

[NormandoHall]

Describe the problem

I want to add extra data to the enhanced form before submit (captcha token in my case), I can't because can't be an async function.

<script>
  import x (async function)
<script>
<form
    action="?/login"
    method="POST"
    use:enhance={async ({ data }) => {
      await x;

      return async ({ result }) => {
        await invalidateAll();
        await applyAction(result);
      };
    }}
  >

    <input..../>
    <input..../>

    <button type="submit">Submit>/button>
  </form>

Based on: #7581

Describe the proposed solution

Make enhanced function async use:enhance={async ({ data }) => { or add as a note in form documentation.

Alternatives considered

No response

Importance

nice to have

Additional Information

No response