fix(docs): update query method to use first() for consistency

[cirolosapio]

❓ 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)

there are many queryContent calls using various methods that typeScript complains about in the playground folder as well
should those be updated too? I'm new to nuxt content

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[pkg-pr-new]

npm i https://pkg.pr.new/@nuxt/content@3430

commit: 1056a89

[farnabaz]

Thanks for the PR
You can ignore playground for now, I have plan to rewrite it

[farnabaz]

Thanks