docs: correct default highlight.langs in JSDoc

[Mini-ghost]

🔗 Linked issue

N/A

❓ 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

The current JSDoc comment mentions that the default setting for highlight.langs is ['js', 'ts', 'vue', 'css', 'html', 'vue', 'shell']. However, the actual default in @nuxtjs/mdc is ['js', 'jsx', 'json', 'ts', 'tsx', 'vue', 'css', 'html', 'vue', 'bash', 'md', 'mdc', 'yaml'].

📝 Checklist

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

[farnabaz]

Thanks