certificate-authentication: small updates (#21951)

[ti-chi-bot]

This is an automated cherry-pick of #21951

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[gemini-code-assist]

Summary of Changes

Hello @ti-chi-bot, 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 minor but important updates to the certificate-authentication.md documentation. The changes primarily focus on improving the clarity, accuracy, and consistency of the guide for configuring certificate authentication in TiDB. This includes removing unnecessary shortcodes, standardizing command syntax, correcting descriptions for certificate requirements, and adding a crucial command for reloading TLS configurations, making the documentation more precise and user-friendly.

Highlights

• Documentation Cleanup: Removed redundant {{< copyable >}} shortcodes from various code blocks (bash, SQL, TOML) to streamline the markdown and improve readability.
• Casing Standardization: Standardized the casing of REQUIRE clauses (e.g., require ssl to REQUIRE SSL, require issuer to REQUIRE ISSUER) for consistency in certificate configuration documentation.
• Clarified REQUIRE CIPHER Description: Updated the description for REQUIRE CIPHER to accurately reflect that it checks the connection's cipher, rather than the client certificate's subject information.
• TLS Reload Command Added: Included the ALTER INSTANCE RELOAD TLS; command in the server key rotation steps, providing a clear instruction for reloading TLS configurations.
• Command Formatting Improvements: Adjusted spacing in mysql client connection commands (e.g., mysql -utest to mysql -u test) for improved clarity and consistency.

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[gemini-code-assist]

Code Review

This pull request introduces several beneficial updates to the certificate authentication documentation. The removal of copyable shortcodes, standardization of keyword casing to uppercase (e.g., REQUIRE), and improved formatting in code blocks all enhance the document's clarity and consistency. The correction to the REQUIRE CIPHER description and the more detailed instructions for reloading server certificates are particularly helpful. I have one suggestion to correct a file path in a command to ensure it aligns with the steps described in the document.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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