docs(mdc): fix {attribute} examples

[nobkd]

🔗 Linked issue

❓ 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

As Tailwind isn't used by Docus anymore, the class names aren't providing styling by themselves. I added the corresponding style tags to fix this.
This has also been changed for lines 347-349 in a previous PR #1982.

I am not sure, if it is good to do this, because the class name styling won't work if someone tries doing it with Docus.
Maybe a warning or info should be added, that the styling with classes just works with e.g. Tailwind?
I mean... the props are assigned, just the styling would be missing.

📝 Checklist

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

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[farnabaz]

The section is about the inline attributes, so I think it would also make sense that in the code sample, we use style attribute to show the usage, it is not necessary to use classes.

  ```md [Code]
  Hello [World]{style="background-color: var(--color-primary-500)" .custom-class}!
  \```

  ::code-block{label="Preview"}
  Hello [World]{style="background-color: var(--color-primary-500)" .custom-class}!
  ::