Update system-variable of ‘tidb_service_scope’

[Frank945946]

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Update system-variable of ‘tidb_service_scope’

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[gemini-code-assist]

Summary of Changes

Hello, 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 refines the documentation for the tidb_service_scope system variable, providing important details about its case-insensitivity behavior. This ensures that users have precise and up-to-date information for configuring this variable, which is critical for the TiDB Distributed eXecution Framework (DXF).

Highlights

• Documentation Update for tidb_service_scope: The documentation for the tidb_service_scope system variable has been updated to clarify that its value is case-insensitive since TiDB v8.5.6. The system now converts the input value to lowercase for storage and comparison.

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Changelog

• system-variables.md
  • Added a note indicating that the tidb_service_scope system variable is case-insensitive since v8.5.6 and is converted to lowercase for storage.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the tidb_service_scope system variable to note that its value has become case-insensitive since v8.5.6. My review found a minor typo in the added description, which I've corrected with a suggestion.

_{Note: Security Review has been skipped due to the limited scope of the PR.}

[gemini-code-assist]

There's a small typo here. "Sinc" should be "Since".

Suggested change

	- Optional value: a string with a length of up to 64 characters. Valid characters include digits `0-9`, letters `a-zA-Z`, underscores `_`, and hyphens `-`. Sinc v8.5.6, the value of this variable is case-insensitive. The system converts the input value to lowercase for storage and comparison.
	- Optional value: a string with a length of up to 64 characters. Valid characters include digits `0-9`, letters `a-zA-Z`, underscores `_`, and hyphens `-`. Since v8.5.6, the value of this variable is case-insensitive. The system converts the input value to lowercase for storage and comparison.

References

1. The style guide requires correcting spelling mistakes. ^(link)