tiproxy: info about API access restrictions

[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 TiProxy documentation by introducing a dedicated section on API access control. The update provides users with essential information on securing their TiProxy API endpoints, covering both TLS-based client certificate validation and network-level firewall configurations. This ensures that users can effectively manage and restrict access to their TiProxy instances.

Highlights

• API Access Control Documentation: Added a new section to the TiProxy API documentation detailing how to restrict access to the API.
• TLS-based Access Restriction: Information on using TLS via server-tls and client certificate common names for API access control has been included.
• Firewall Rules for Access: Guidance on utilizing firewall rules for API access control when TLS is not employed has been added.

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[gemini-code-assist]

Code Review

This pull request adds a section on access control for the TiProxy API. My review focuses on improving the clarity, technical accuracy, and style of the new content based on the repository's documentation style guide. I've suggested a revision to correct a configuration parameter and align the text with the preferred active voice and second-person narrative.