docs: add note about fetching data on initial load

[danielroe]

🔗 Linked issue

resolves nuxt/nuxt#14694

❓ 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

This adds a note about a limitation of server: false data fetching and updates a couple of other minor inaccuracies..

📝 Checklist

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

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[pi0]

Thanks for pointing this out. It seems a buggy behavior to me since we could make data available after awaiting for client-side only. But let's document warning until fixing (read topic. hydration is tricky indeed)

[danielroe]

I don't think we can wait in setup, or we will cause a hydration error.