Deprecating float style prop in custom formatter

[tpodugu-ms]

Category

• Content fix
• New article

What's in this Pull Request?

🎯 Update Important Notice on CSS Support in Microsoft Lists Custom Formatter
🔧 Changes Made
Updated the formatting guidance to highlight that float may no longer be supported in Microsoft Lists custom formatting.

Introduced an CAUTIONcallout using [!CAUTION] Markdown syntax to improve visibility and clarity for users.

Recommended Gallery View as a more stable alternative for users relying on unsupported styling.

📌 Why This Change?
Ensures users are aware of the deprecation of float in custom formatter styles.
Encourages a smoother transition by suggesting a more reliable solution (Gallery View).

Enhances readability and provides a clear, visually distinct warning.

[learn-build-service-prod]

Learn Build status updates of commit f8a8707:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/declarative-customization/formatting-syntax-reference.md	✅Succeeded	View

For more details, please refer to the build report.

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