Update the scope of system-variable ”tidb_redact_log“

[Frank945946]

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What is changed, added or deleted? (Required)

Updated the scope of tidb_redact_log from "SESSION | GLOBAL" to "GLOBAL".

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• This PR is translated from: Update the scope of system-variable ”tidb_redact_log“ docs-cn#20721
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[gemini-code-assist]

Summary of Changes

Hello @Frank945946, 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 focuses on enhancing the accuracy of the TiDB documentation by rectifying the scope definition for the tidb_redact_log system variable. This change ensures that the documentation precisely reflects the variable's configuration capabilities, providing clearer guidance for users.

Highlights

• Documentation Correction: The scope of the tidb_redact_log system variable has been updated in the system-variables.md file. Previously, it was incorrectly listed as having both SESSION and GLOBAL scope, but it has now been corrected to only GLOBAL scope.

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[gemini-code-assist]

Code Review

This pull request correctly updates the documentation for the tidb_redact_log system variable to reflect that it now only has GLOBAL scope. The change is accurate and improves the documentation.

I've added one minor suggestion to wrap the GLOBAL keyword in backticks for stylistic consistency, in line with the project's style guide.

For future contributions, please remember to use backticks for code elements (like `tidb_redact_log`) in PR titles and descriptions, and note that "system variable" is typically two words. Thanks for your contribution!

[lilin90]

/lgtm

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-08-06 07:04:52.252151024 +0000 UTC m=+424602.394912199: ☑️ agreed by lilin90.