config: reword primary lease descriptions for clarity

[yahonda]

What is changed, added or deleted? (Required)

Reword the lease\> description in scheduling-configuration-file.mdandtso-configuration-file.mdto avoid confusion with databasePRIMARY KEY` terminology.

Before:

The timeout of the Scheduling Primary Key lease. After the timeout, the system re-elects a Primary.

After:

The timeout of the scheduling service's primary lease. After the timeout, the system re-elects a primary.

Similarly for the TSO configuration file.

Which TiDB version(s) do your changes apply to? (Required)

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)
• v5.3 (TiDB 5.3 versions)

What is the related PR or file link(s)?

• Related simplified Chinese source:
  • https://github.com/pingcap/docs-cn/blob/release-8.5/scheduling-configuration-file.md
  • https://github.com/pingcap/docs-cn/blob/release-8.5/tso-configuration-file.md

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

Summary by CodeRabbit

• Documentation
  • Clarified lease descriptions for the Scheduling and TSO services.
  • Updated terminology for primary leases and re-election behavior.
  • Updated the default lease timeout from 3 to 5 seconds.

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[gemini-code-assist]

Code Review

This pull request updates the documentation for the scheduling and TSO configuration files, rephrasing the description of the lease timeout to refer to the service's primary lease. Feedback suggests capitalizing "Scheduling" in the scheduling configuration file to maintain consistency with "TSO" and other occurrences in the document.

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[qiancai]

@bufferflies would you please take a look at this PR? Thanks.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 1df8ff1 and 0449164.

📒 Files selected for processing (2)

• scheduling-configuration-file.md
• tso-configuration-file.md

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📝 Walkthrough

Walkthrough

The changes update lease descriptions for the Scheduling and TSO services. The descriptions identify each service’s primary lease, use lowercase re-election terminology where applicable, and change the default timeout from 3 to 5 seconds.

Changes

Lease description updates

Layer / File(s)	Summary
Update service lease descriptions scheduling-configuration-file.md, tso-configuration-file.md	The lease descriptions identify the Scheduling and TSO services’ primary leases. Both default timeouts change from 3 to 5 seconds.

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: rewording primary lease descriptions for clarity.
Description check	✅ Passed	The description explains the changes, affected TiDB version, related files, and applicable change categories.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

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• Create PR with unit tests

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