docs(api): fix useAsyncData signature

[cawa-93]

Update signature acording to

framework/packages/nuxt/src/app/composables/asyncData.ts

Lines 20 to 43 in 80a66dc

	exportinterfaceAsyncDataOptions<
	DataT,
	Transformextends_Transform<DataT,any>=_Transform<DataT,DataT>,
	PickKeysextendsKeyOfRes<_Transform>=KeyOfRes<Transform>
	>{
	server?: boolean
	lazy?: boolean
	default?: ()=>DataT|Ref<DataT>|null
	transform?: Transform
	pick?: PickKeys
	watch?: MultiWatchSources
	initialCache?: boolean
	}
	exportinterfaceRefreshOptions{
	_initial?: boolean
	}
	exportinterface_AsyncData<DataT,ErrorT>{
	data: Ref<DataT|null>
	pending: Ref<boolean>
	refresh: (opts?: RefreshOptions)=>Promise<void>
	error: Ref<ErrorT|null>
	}

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

I noticed that the signature in the documentation was different from the actual one and made the changes.

In particular, documented that data now may be null, after f350a70

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[pi0]

Thanks!