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

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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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