add Premium feature documentation

[ljun0712]

What is changed, added or deleted? (Required)

add Premium feature documentation

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[gemini-code-assist]

Summary of Changes

Hello @ljun0712, 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 significantly expands the TiDB Cloud documentation by introducing new guides for Premium cluster features. It covers essential security configurations like IP access lists and TLS connections, provides detailed instructions for connecting to Premium clusters via public endpoints, and clarifies the cluster deletion process. The changes aim to provide a more complete and consistent documentation experience for users of TiDB Cloud Premium.

Highlights

• New Premium Feature Documentation: Added new documentation files covering key features for TiDB Cloud Premium clusters, including configuring IP access lists, connecting via public endpoints, and managing TLS connections.
• Updated Connection Guides: Existing connection documentation has been updated to explicitly include TiDB Cloud Premium clusters, ensuring comprehensive guidance across all cluster tiers.
• TLS Connection Details: A dedicated document for TLS connections to TiDB Cloud Premium clusters has been added, providing detailed steps and code examples for various programming languages and clients.
• Cluster Deletion Process: New documentation outlines the process for deleting TiDB Cloud clusters, with specific considerations for Premium clusters regarding backups and restoration.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the new TiDB Cloud Premium feature, including guides for IP access lists, public connections, cluster deletion, and TLS connections. The new content is comprehensive and well-structured. My review focuses on improving clarity, ensuring terminological consistency (using 'Premium' instead of 'Dedicated'), and correcting minor grammatical and formatting issues to align with the repository's style guide. I have provided specific suggestions to enhance readability and correctness.

[gemini-code-assist]

The summary could be more descriptive for users. Also, 'premium' should be capitalized to 'Premium' for consistency.

Suggested change

	summary: Introduce TLS connections in TiDB Cloud premium.
	summary: Learn about TLS connections for TiDB Cloud Premium clusters.

[gemini-code-assist]

The word 'versions' is redundant when listing the TLS versions. Removing it will make the sentence more concise.

Suggested change

On TiDB Cloud, establishing TLS connections is one of the basic security practices for connecting to TiDB Cloud Premium clusters. You can configure multiple TLS connections from your client, application, and development tools to your TiDB Cloud Premium cluster to protect data transmission security. For security reasons, TiDB Cloud Premium only supports TLS 1.2 and TLS 1.3, and does not support TLS 1.0 and TLS 1.1 versions.

On TiDB Cloud, establishing TLS connections is one of the basic security practices for connecting to TiDB Cloud Premium clusters. You can configure multiple TLS connections from your client, application, and development tools to your TiDB Cloud Premium cluster to protect data transmission security. For security reasons, TiDB Cloud Premium only supports TLS 1.2 and TLS 1.3, and does not support TLS 1.0 and TLS 1.1.

[gemini-code-assist]

This line uses a full-width colon (：) instead of a standard English colon (:).

Suggested change

	Parameter descriptions：
	Parameter descriptions:

[gemini-code-assist]

For consistency with UI element styling, consider using sentence case for this link text, for example, 'Show example usage'.

Suggested change

	You can click **show example usage** to view detailed code examples.
	You can click **Show example usage** to view detailed code examples.

[gemini-code-assist]

The word 'versions' is redundant here and can be removed to make the sentence more concise.

Suggested change

	For security reasons, TiDB Cloud Premium only supports TLS 1.2 and TLS 1.3, and does not support TLS 1.0 and TLS 1.1 versions. See IETF [Deprecating TLS 1.0 and TLS 1.1](https://datatracker.ietf.org/doc/rfc8996/) for details.
	For security reasons, TiDB Cloud Premium only supports TLS 1.2 and TLS 1.3, and does not support TLS 1.0 and TLS 1.1. See IETF [Deprecating TLS 1.0 and TLS 1.1](https://datatracker.ietf.org/doc/rfc8996/) for details.

[gemini-code-assist]

The word 'currently' is redundant and can be removed for conciseness.

Suggested change

	TiDB Cloud Premium only supports one-way TLS authentication, and does not support two-way TLS authentication currently. If you need two-way TLS authentication, contact [TiDB Cloud Support](/tidb-cloud/tidb-cloud-support.md).
	TiDB Cloud Premium only supports one-way TLS authentication, and does not support two-way TLS authentication. If you need two-way TLS authentication, contact [TiDB Cloud Support](/tidb-cloud/tidb-cloud-support.md).

[gemini-code-assist]

Warning

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[ti-chi-bot]

@ljun0712: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	22cc932	link	true	/test pull-verify

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