docs: sync useAsyncData and useFetch types

[jongmin4943]

Synchronize type AsyncData with asyncData.d.ts

🔗 Linked issue

none

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

I opened discussion #20885. It was questions of data-fetching.
I decided to dig into that so I checked the codes and found that in useFetch and useAsyncData docs, type definition is different from asyncData.d.ts. type AsyncData in useFetch docs is even wrong.

type AsyncData<DataT> = {  // where is Error generic?
  data: Ref<DataT>
  pending: Ref<boolean>
  refresh: (opts?: { dedupe?: boolean }) => Promise<void>
  execute: () => Promise<void>
  error: Ref<Error | boolean>
}

There is a property in AsyncDataExecuteOptions which is _initial but I didn't added it since I couldn't find anything relative that in Nuxt docs.

📝 Checklist

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

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