docs: deprecate tidb_enable_auto_analyze_priority_queue

[0xPoe]

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What is changed, added or deleted? (Required)

Deprecate the tidb_enable_auto_analyze_priority_queue setting, as we intend to use it to schedule the auto-analyze jobs by default.

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• Other reference link(s): sessionctx: mark tidb_enable_auto_analyze_priority_queue as deprecated tidb#62659

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[gemini-code-assist]

Summary of Changes

Hello @0xPoe, 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!

I have updated the documentation to reflect the deprecation of the tidb_enable_auto_analyze_priority_queue system variable. This change is necessary because, starting from TiDB v9.0.0, the functionality controlled by this variable—the priority queue for automatically collecting statistics—will be enabled by default. The update ensures that users are aware of this upcoming change and the variable's eventual removal, providing clear guidance on the system's behavior.

Highlights

• System Variable Deprecation: I have added a warning to the documentation for the tidb_enable_auto_analyze_priority_queue system variable. This warning explicitly states that the variable will be deprecated starting from TiDB v9.0.0, as the priority queue for auto-analyze will be enabled by default.
• Documentation Formatting: I have made a minor formatting correction within the system-variables.md file, specifically by adjusting a newline character in a note block to improve readability and consistency.

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[gemini-code-assist]

Code Review

This pull request deprecates the tidb_enable_auto_analyze_priority_queue system variable. The changes look good. I've added a minor suggestion to improve the wording and formatting of the deprecation notice for better clarity and consistency, in line with the documentation style guide.