enable-tls-between-clients-and-servers: add TiProxy

[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 enhances the documentation for enabling TLS between clients and servers by incorporating instructions and references for configuring TiProxy to handle TLS connections. The update ensures that users have comprehensive guidance on securing their TiDB deployments when using TiProxy.

Highlights

• TiProxy TLS Configuration: Added a new section detailing how to configure TiProxy to use TLS connections, including references to relevant TiProxy documentation for sql-tls and security.
• Documentation Formatting: Made minor formatting adjustments, such as correcting the case of SQL commands (CREATE USER, ALTER USER) and removing an unnecessary empty copyable block.

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[gemini-code-assist]

Code Review

This pull request adds documentation for enabling TLS for TiProxy. The changes are generally good, but I have a couple of suggestions to improve clarity and consistency with the rest of the documentation. One change accidentally removed a copyable code block feature, which I've suggested restoring. Another suggestion improves the wording to be more direct and user-friendly, in line with the style guide.