docs: fix sync-diff-inspector limitations in migration tools (#23887)

[ti-chi-bot]

This is an automated cherry-pick of #23887

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):

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.

• 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)?

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

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 the migration tools overview to consolidate sync-diff-inspector limitations into a single reference to the detailed restrictions section.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository: pingcap/docs/.coderabbit.yaml

Review profile: ASSERTIVE

Plan: Advanced

Run ID: aca2c4c7-d278-4d89-85dc-786eaeb51e77

📥 Commits

Reviewing files that changed from the base of the PR and between 2ed75b5 and 1a6a416.

📒 Files selected for processing (1)

• migration-tools.md

Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review.

---

📝 Walkthrough

Walkthrough

The sync-diff-inspector entry in migration-tools.md replaces two restriction bullets with one bullet that links to the detailed restrictions documentation.

Changes

Sync-diff-inspector restrictions

Layer / File(s)	Summary
Consolidate restriction guidance migration-tools.md	The entry now covers online-check, data-type comparison, and inconsistent-data repair limitations. It links to the “Restrictions of sync-diff-inspector” section.

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	The title clearly identifies the documentation change and the affected sync-diff-inspector limitations entry.
Description check	✅ Passed	The description explains the change, identifies the affected v8.5 version, and provides related references. The optional first-time contributor and AI agent sections are omitted, but the required sect…
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.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create a new PR

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [qiancai]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

In response to a cherrypick label: base branch (master) needs to differ from target branch (master).

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #23906.
But this PR has conflicts, please resolve them!