docs(ComponentCard): fix inline highlighter

[KeJunMao]

🔗 Linked issue

fixed #748

❓ 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)
• ✨ 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

Use the default return value of the getHighlightedAST function, by https://github.com/nuxt-modules/mdc/blob/main/src/runtime/shiki/highlighter.ts#L97-L102

📝 Checklist

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

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Name	Status	Preview	Updated (UTC)
ui	✅ Ready (Inspect)	Visit Preview	Sep 28, 2023 9:27am

[benjamincanac]

Thanks a lot! 😊