certificate-authentication: small updates

[dveeden]

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[gemini-code-assist]

Summary of Changes

Hello @dveeden, 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 several minor yet impactful updates to the certificate-authentication.md documentation. The changes aim to enhance the clarity, consistency, and accuracy of the guide for setting up and managing certificate-based authentication in TiDB, ensuring users have precise instructions for generating certificates, configuring servers and clients, and handling certificate rotations.

Highlights

• Documentation Clarity: Removed redundant copyable shortcodes from code blocks and standardized command syntax for improved readability and conciseness.
• Configuration Consistency: Updated REQUIRE directives to consistent uppercase casing and corrected the description for REQUIRE CIPHER to accurately reflect its function.
• Server Configuration Guidance: Enhanced instructions for reloading TLS configuration on the TiDB server, including a specific SQL command for clarity.

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[gemini-code-assist]

Code Review

This pull request introduces several small but useful updates to the certificate-authentication.md documentation. The changes include removing legacy copyable shortcodes, improving the formatting of code blocks for better readability and syntax highlighting, and correcting some technical details and terminology for consistency (e.g., using REQUIRE instead of require). These updates enhance the clarity and accuracy of the document. I've found one minor formatting issue and suggested a fix.