[ti-chi-bot]

This is an automated cherry-pick of #21964

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

• Update multi-data-centers-in-one-city-deployment.md to use the current default Region size (256 MiB) instead of the outdated 96M.
• Keep the Chinese page aligned with the English source page for the same fix.

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• 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)

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

• Related code change PR links (if applicable):
• This PR is translated from: docs: fix outdated Region size in multi-AZ deployment doc docs#24204
• Other reference link(s): https://docs.pingcap.com/zh/tidb/dev/tikv-configuration-file/#region-split-size

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

• 文档
  • 补充不同 TiDB 版本中新分裂 Region 的默认大小说明：v8.4.0 及以上约为 256 MiB，早于 v8.4.0 的版本约为 96 MiB。
  • 将 Region 切分描述调整为按 Region 划分。

[coderabbitai]

No actionable comments were generated in the recent review.

Recent review info

Run configuration

• Source mode: Auto
• Repository: pingcap/docs-cn
• Branch: release-8.5
• File: .coderabbit.yaml
• Commit: 17c5851
• Layers: Repository YAML
• Review profile: ASSERTIVE
• Plan: Advanced
• Run ID: 0b9cdea8-f04f-4242-bd9a-df467ad46df4

Commits

Reviewing files that changed from the base of the PR and between 17c5851 and 28aedc8.

Files selected for processing: 1

• multi-data-centers-in-one-city-deployment.md

Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 3 remain after this review.

Walkthrough

文档更新了 TiKV 数据划分和 Region 默认大小的说明：TiDB v8.4.0 及以上版本约为 256 MiB，早于 v8.4.0 的版本约为 96 MiB。

Changes: Region 大小说明

Layer / File(s)	Summary
更新 Region 大小说明 multi-data-centers-in-one-city-deployment.md	文档改为按 Region 描述 TiKV 数据划分，并按 TiDB 版本说明新分裂 Region 的默认大小。

Priority: Low

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

Change: Other

Possibly related PRs

• pingcap/docs-cn#21964：更新同一文件中 Region 默认大小的说明，内容与本次改动相同。

Suggested reviewers: qiancai

Merge Risk: Minimal · up to 28aed

This documentation update does not introduce an identified production or deployment risk.

Pre-merge checks: 5

Check name	Status	Explanation
Description check		PR 描述完整说明了文档变更、适用版本、关联 PR 和参考链接，并勾选了 master 与 v8.5。内容与实际变更一致。
Title check		标题准确概括了主要变更：修正多可用区部署文档中过时的 Region 大小。
Docstring Coverage		No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within survi…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No eligible functions found in the changed files. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)

Finishing Touches

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• Create a new PR

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[lilin90]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lilin90

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