Add documentation for TLS connections to premium instances

[ljun0712]

What is changed, added or deleted? (Required)

This document introduces TLS connections for TiDB Cloud premium instances, detailing prerequisites, secure connection methods, and certificate management.

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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 introduces new documentation aimed at guiding users through the process of establishing secure TLS connections to TiDB Cloud premium instances. The new content outlines prerequisites, provides detailed steps for connecting, explains certificate management, and addresses common questions regarding supported TLS versions and authentication methods. This addition significantly enhances the clarity and security guidance available to users of premium instances.

Highlights

• New Documentation for TLS Connections: A new comprehensive document has been added that details how to establish TLS connections to TiDB Cloud premium instances, covering various aspects of secure connectivity.
• Security Standards and Supported Versions: The documentation specifies that premium instances support TLS 1.2 and TLS 1.3, and highlights that CA certificates are sourced from AWS Private Certificate Authority, meeting FIPS 140-2 Level 3 security standards.
• Step-by-Step Connection Guide: Users are provided with a clear, step-by-step guide on how to securely connect to their premium instances via the TiDB Cloud console, including instructions for downloading the necessary CA certificate.
• Clarification on TLS Authentication and Configuration: The document clarifies that only one-way TLS authentication is currently supported and that the require_secure_transport variable is not user-configurable on premium instances.

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Code Review

This pull request adds a new documentation page about establishing TLS connections to TiDB Cloud premium instances. My review focuses on improving clarity, conciseness, and consistency, following the repository's style guide. I've suggested several wording improvements to make the document easier to understand, corrected inconsistent terminology (e.g., 'CA cert' vs. 'CA certificate'), and recommended removing a redundant section to improve the document's structure.

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