docs: mention when useId composable was introduced

[ojvribeiro]

❓ 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

This PR adds a message to useId composable documentation saying in what Nuxt version it was introduced.

📝 Checklist

• I have updated the documentation accordingly.

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Nuxt Docs	Edit on Studio ↗︎	View Live Preview	f150ad5

[danielroe]

Thank you!