Revert "Revert "v8.5.6: system-variables: add doc for `tidb_max_dist_…

[hfxsd]

…task_nod…"

This reverts commit d6f3bcf.

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[gemini-code-assist]

Code Review

This pull request introduces documentation for the new system variable tidb_max_dist_task_nodes in TiDB v8.5.6, which controls the maximum number of TiDB nodes used by the Distributed eXecution Framework (DXF). Feedback was provided to improve the clarity, conciseness, and consistency of the documentation, specifically by using the 'DXF' acronym, addressing the user in the second person, and refining grammatical structures to align with the style guide.

[hfxsd]

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