docs: update and shorten server example

[iiio2]

🔗 Linked issue

❓ 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

Here the single line export default defineEventHandler((event) => `Hello, ${event.context.params.name}!`) is long. That is why the full code becomes blur in the doc.

It is not readable and we cannot see the full code by default in the doc. Making it two lines removes the blur issue.

I think it is required because by default the line becomes blur in the doc. we cannot see the entire line because of long single line of code. That is why we can make it readable.

📝 Checklist

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

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