v8.5.6: system-variables: add doc for tidb_max_dist_task_nodes (#20718)

[ti-chi-bot]

This is an automated cherry-pick of #20718

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• This PR is translated from:system-variables: add doc for tidb_max_dist_task_nodes docs-cn#19878
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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 enhances the TiDB documentation by introducing a new entry for the tidb_max_dist_task_nodes system variable. This update provides users with essential information regarding the configuration and behavior of distributed execution tasks within TiDB, ensuring clarity on how to manage resource allocation for these tasks.

Highlights

• New System Variable Documentation: Added comprehensive documentation for the tidb_max_dist_task_nodes system variable, detailing its scope, persistence, type, default value, range, and behavior, including its interaction with tidb_service_scope.

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Changelog

• system-variables.md
  • Added documentation for the tidb_max_dist_task_nodes system variable.

Activity

• Automated cherry-pick of system-variables: add doc for tidb_max_dist_task_nodes #20718.
• Contributor License Agreement signed.
• Changes applied to master and v9.0 branches.

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[gemini-code-assist]

Code Review

This pull request adds documentation for the new system variable tidb_max_dist_task_nodes. The changes are clear and well-structured. I have provided a minor suggestion to improve clarity and conciseness, following the repository's documentation style guide.

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