docs: block cluster pause when PITR or Data Migration is active

[xboxeer]

What's changed

Clusters with Point-in-Time Restore (PITR) enabled or a Data Migration job running can no longer be paused directly. The pause request is rejected with a clear error until users explicitly disable PITR / stop the migration job.

Documentation changes

Adds two new bullets to the Limitations section of tidb-cloud/pause-or-resume-tidb-cluster.md.

Summary by CodeRabbit

• Documentation
  • Documented limitations for pausing TiDB clusters when Point-in-Time Recovery (PITR) is enabled or a Data Migration job is running.
  • Clarified that users must disable PITR and ensure no migration job is active before pausing a cluster.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 88402df and 7cae485.

📒 Files selected for processing (1)

• tidb-cloud/pause-or-resume-tidb-cluster.md

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📝 Walkthrough

Walkthrough

The pause and resume documentation now states that users must disable PITR or stop a running Data Migration job before pausing a TiDB cluster.

Changes

Pause Restrictions

Layer / File(s)	Summary
Document pause conditions tidb-cloud/pause-or-resume-tidb-cluster.md	Adds restrictions for clusters with PITR enabled or a running Data Migration job. It states the required remediation steps.

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

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the change but omits required version applicability, related links, and checklist sections from the repository template.	Add the required version selection, related PR or file links, AI involvement, and change-impact checklist sections.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the documentation change to block cluster pauses when PITR or Data Migration is active.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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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[LGTM Timeline notifier]

Timeline:

• 2026-07-31 09:37:00.362894121 +0000 UTC m=+2175206.398989177: ☑️ agreed by qiancai.

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