tikv-configuration-file, dynamic-config: fix the tombstones key names

[sary8]

What is changed, added, or deleted? (Required)

The gc.auto-compaction options tombstone-num-threshold and tombstone-percent-threshold are documented with the wrong names. TiKV uses tombstones-num-threshold and tombstones-percent-threshold.

The documented names are rejected by --config-check and are not applied during normal startup.

This PR:

• renames the two options in tikv-configuration-file.md and dynamic-config.md
• updates links affected by the changed heading anchors

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

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 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)

The same spelling is present in release-8.5 and release-7.5.

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

• Related code change PR links (if applicable):
• This PR is translated from:
• Other reference link(s):
  • https://github.com/tikv/tikv/blob/2328c500488427de512da008a4822e422cbb3822/src/server/gc_worker/config.rs#L37-L44
  • https://github.com/tikv/tikv/blob/2328c500488427de512da008a4822e422cbb3822/cmd/tikv-server/src/main.rs#L172-L201

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

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
  • Updated TiKV configuration documentation to use the corrected plural names for automatic compaction tombstone thresholds.
  • Updated related descriptions, references, and deprecation guidance to point to the renamed configuration items.

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[ti-chi-bot]

Hi @sary8. Thanks for your PR.

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📝 Walkthrough

Walkthrough

The documentation renames two gc.auto-compaction configuration items from tombstone to tombstones. Related headings, anchors, and deprecation references use the updated names.

Changes

Configuration Name Update

Layer / File(s)	Summary
Rename configuration names and references dynamic-config.md, tikv-configuration-file.md	The two configuration names, section headings, internal anchors, and deprecation references now use tombstones. Descriptions remain unchanged.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

Suggested reviewers: qiancai

Merge Risk: ⚪ Minimal · up to 72f12

The PR is mergeable; the pre-existing v7.5 and v8.5 documentation anchors should be fixed separately.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description covers the required change, affected files, TiDB version, related implementation links, AI involvement, and applicable change classifications. It is complete and aligned with the PR ob…
Title check	✅ Passed	The title clearly identifies the affected documentation files and the correction of the tombstones key names.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

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Actionable comments posted: 1

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📥 Commits

Reviewing files that changed from the base of the PR and between a343636 and 72f1207.

📒 Files selected for processing (2)

• dynamic-config.md
• tikv-configuration-file.md

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