docs: fix sync-diff-inspector limitations in migration tools (#21937) (#21942)

[ti-chi-bot]

This is an automated cherry-pick of #21942

This is an automated cherry-pick of #21937

What is changed, added or deleted? (Required)

This PR updates the sync-diff-inspector row in migration-tools.md on release-8.5 to match the detailed stable documentation.

• Remove the incorrect statement that JSON, BIT, BINARY, and BLOB data are unsupported.
• Clarify that JSON, BLOB/VARBINARY, and BIT are supported.
• Point readers to the detailed restrictions page for FLOAT/DOUBLE and collation-related considerations.

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

Tips for choosing the affected version(s):

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• 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)

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

• This PR is translated from: docs: fix sync-diff-inspector limitations in migration tools docs#23887
• Other reference link(s):
  • sync-diff-inspector: clarify data type support and improve collation guidance docs#22165
  • https://docs.pingcap.com/zh/tidb/stable/sync-diff-inspector/sync-diff-inspector-overview/
  • https://docs.pingcap.com/zh/tidb/stable/migration-tools/

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
  • 更新 migration-tools 使用限制说明，明确 MySQL 与 TiDB 数据同步场景不支持在线校验。
  • 补充说明部分数据类型比较，以及无主键或唯一索引表的不一致数据修复仍存在限制。
  • 统一相关表述，提升限制信息的清晰度。

[ti-chi-bot]

@ti-chi-bot This PR has conflicts, I have hold it.
Please resolve them or ask others to resolve them, then comment /unhold to remove the hold label.

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📝 Walkthrough

Walkthrough

migration-tools.md 明确了 sync-diff-inspector 在 MySQL 和 TiDB 数据同步场景中的在线校验限制，并补充了部分数据类型比较及无主键或唯一索引表不一致数据修复的限制。

Changes

同步工具限制说明

Layer / File(s)	Summary
明确同步工具使用限制 migration-tools.md	“使用限制”段落明确说明 MySQL 和 TiDB 之间的数据同步不支持在线校验。段落同时保留部分数据类型比较及无主键或唯一索引表不一致数据修复的限制。

Priority: ⬇️ Low

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

Change: Other

Suggested reviewers: qiancai

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题明确说明了文档范围和主要变更，且与 sync-diff-inspector 限制说明的更新一致。
Description check	✅ Passed	描述包含变更内容、适用版本、相关链接、AI 参与情况和其他必需检查项。内容与文档更新目标相关，整体完整。
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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[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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