Fix minor errors in performance tuning config

[hfxsd]

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[gemini-code-assist]

Summary of Changes

Hello @hfxsd, 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've made several minor corrections and improvements to the tidb-performance-tuning-config.md documentation. My aim was to enhance the readability, consistency, and accuracy of the configuration guide. This includes fixing formatting issues, standardizing capitalization in tables, and providing clearer links to related documentation, all to ensure that users have the most precise and helpful information when tuning TiDB performance.

Highlights

• Documentation Formatting: I've updated the formatting for the 'Trade-offs' section related to RocksDB Titan configuration, converting a simple numbered list into an unordered HTML list to ensure it renders correctly and is more readable within the documentation.
• Typographical Correction: I've made minor capitalization adjustments in the performance comparison table, specifically changing 'load data' to 'Load data' and 'workloada' to 'Workload' for better consistency and presentation.
• Documentation Clarity and Linking: I've enhanced the clarity of the 'Auto-commit' instruction by adding a direct markdown link to the autocommit system variable documentation, allowing users to easily navigate to the relevant details.

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[gemini-code-assist]

Code Review

This pull request introduces several minor fixes to the performance tuning documentation. The changes improve formatting and clarity in a few places. My review includes suggestions to further enhance formatting consistency and to correct a change that inadvertently altered a specific workload name.

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