cloud: add a tip about how to request a feature in private preview

[qiancai]

What is changed, added or deleted? (Required)

• Add a tip about how to request a feature in private preview
• Decrease the size of ❌

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[gemini-code-assist]

Summary of Changes

Hello @qiancai, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the tidb-cloud/features.md documentation by providing clear instructions for users interested in requesting private preview features. It also includes a minor visual adjustment to the feature support table, making the '❌' symbols consistently smaller for improved readability.

Highlights

• Private Preview Feature Request Tip: Added a new tip section to the tidb-cloud/features.md document, guiding users on how to request features that are currently in private preview through the TiDB Cloud console.
• Styling Adjustment for '❌' Symbol: Modified the CSS styling for the '❌' symbol within the feature support table in tidb-cloud/features.md to decrease its font size to 14px for better visual presentation.

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[gemini-code-assist]

Code Review

This pull request introduces two main changes. First, it adds a helpful tip explaining how users can request a feature currently in private preview. Second, it reduces the font size of the '❌' icon in the feature support table for better visual presentation. My review focuses on improving the clarity of the new tip by restructuring it as a numbered list, which aligns with the documentation style guide and makes the instructions easier for users to follow.