Update TOC-tidb-cloud-premium.md

[qqqdan]

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[gemini-code-assist]

Summary of Changes

Hello @qqqdan, 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 addresses a minor but important documentation correction within the TiDB Cloud Premium table of contents. The change ensures that users navigating the premium documentation are accurately directed to the guide for creating a premium TiDB Cloud cluster, thereby enhancing the user experience and the precision of the documentation.

Highlights

• Documentation Link Correction: The link for 'Create a TiDB Cloud Cluster' within the 'Manage TiDB Cloud Clusters' section of the premium documentation has been updated. It now correctly points to the create-tidb-cluster-premium.md guide, replacing the previous reference to the serverless cluster creation guide.

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[gemini-code-assist]

Code Review

This pull request correctly updates the 'Create a TiDB Cloud Cluster' link to its 'premium' version, which aligns with the purpose of this Table of Contents file. However, this change is incomplete as many other related links in the file still point to 'serverless' documentation. I've added a comment to highlight the need for updating these other links to ensure a consistent and clear user journey for the TiDB Cloud Premium offering.

[gemini-code-assist]

While updating this link to the ...-premium.md version is the correct step for this 'premium' TOC, the change is incomplete. Several related links in this 'Manage Cluster' section still point to ...-serverless.md documentation, which creates an inconsistent experience for users.

To ensure consistency, please also update the following links to their 'premium' equivalents in this PR:

• Line 136: [Connection Overview](/tidb-cloud/connect-to-tidb-cluster-serverless.md)
• Line 137: [Connect via Public Endpoint](/tidb-cloud/connect-via-standard-connection-serverless.md)
• Line 139: [Back Up and Restore TiDB Cloud Data](/tidb-cloud/backup-and-restore-serverless.md)

There may be other 'serverless' links throughout the file that also need to be updated.