docs: update useFetch return values

[varugasu]

🔗 Linked issue

#21045

❓ 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

In #21045, we have added the status return value to useAsyncData. Since useFetch is a wrapper around useAsyncData, so it has the same return values, but the docs are not updated.

This PR solves it by making the Return Values the same for useFetch and useAsyncData

📝 Checklist

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

[nuxt-studio]

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