[WIP] Update restrictions of the private endpoint of Starter

[sunxiaoguang]

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[gemini-code-assist]

Summary of Changes

Hello @sunxiaoguang, 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 updates the documentation for TiDB Cloud Starter to include an important restriction regarding private endpoints. The change clarifies that a private endpoint is shared across all clusters within the same region, providing users with a more complete understanding of the service's behavior and limitations.

Highlights

• Private Endpoint Restrictions: Added a new restriction to the documentation clarifying that private endpoints are shared among all clusters within the same region for TiDB Cloud Starter.

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[gemini-code-assist]

Code Review

This pull request adds a restriction note about shared private endpoints for Starter clusters. My review includes a suggestion to improve the clarity and consistency of the new text, ensuring it aligns with the terminology used elsewhere in the document.