Add private endpoint management tips.

[ginkgoch]

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What is changed, added or deleted? (Required)

The private endpoint guide missed some tips for how we manage the private endpoints, add those tips for dedicated and premium.

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Summary by CodeRabbit

• Documentation
  • Clarified that private endpoints are shared resources and may be reused by compatible instances or clusters.
  • Documented that endpoints remain available after the associated instance or cluster is deleted.
  • Added lifecycle guidance: unused endpoints are automatically removed after 30 days.
  • Clarified that endpoints cannot be deleted while they are still in use.
  • Specified the applicable resource scope for each deployment type: tenant-level or project-level.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 5c0f503 and 894b7e4.

📒 Files selected for processing (2)

• tidb-cloud/premium/set-up-sink-private-endpoint-premium.md
• tidb-cloud/set-up-sink-private-endpoint.md

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📝 Walkthrough

Walkthrough

The documentation now describes private endpoint scope, sharing, persistence after resource deletion, deletion restrictions, and automatic cleanup after 30 days of inactivity.

Changes

Private endpoint lifecycle

Layer / File(s)	Summary
Document endpoint lifecycle rules tidb-cloud/set-up-sink-private-endpoint.md, tidb-cloud/premium/set-up-sink-private-endpoint-premium.md	The guides document endpoint ownership, sharing, persistence after resource deletion, deletion restrictions while in use, and automatic cleanup after 30 days of inactivity.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: ⚪ Minimal · up to 894b7

This PR adds localized management tips to two private endpoint guides without changing product behavior, so no actionable merge-blocking risk remains after normal checks and review.

Suggested reviewers: qiancai

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description explains the documentation changes and confirms the contributor agreement, but it does not select the required affected TiDB version. The PR objectives identify the release-8.5 branch.	Select the applicable version checkbox, including v8.5 if this PR targets the release-8.5 branch. Add relevant reference links if available.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding private endpoint management tips.
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.

Full details: Docstring Coverage

Explanation

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 files. (2 skipped: 2 unsupported.)

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Actionable comments posted: 1

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📒 Files selected for processing (2)

• tidb-cloud/premium/set-up-sink-private-endpoint-premium.md
• tidb-cloud/set-up-sink-private-endpoint.md

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[ideascf]

LGTM

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[qiancai]

Suggested change

> A private endpoint is a tenant-level resource and is not tied to a specific instance. Private endpoints created within the same tenant and in the same region can be shared by multiple instances connecting to the same downstream service, so you do not need to create a separate endpoint for each instance. Deleting an instance does not delete its private endpoints. You can manually delete a private endpoint when it is no longer needed, or wait for it to be automatically cleaned up after 30 days of inactivity. A private endpoint cannot be deleted if it is still in use by any instance.

> A private endpoint is an organization-level resource and is not tied to a specific {{{ .premium }}} instance. Private endpoints created within the same organization and in the same region can be shared by multiple instances connecting to the same downstream service, so you do not need to create a separate endpoint for each instance. Deleting a {{{ .premium }}} instance does not delete its private endpoints. You can manually delete a private endpoint when it is no longer needed, or wait for it to be automatically cleaned up after 30 days of inactivity. A private endpoint cannot be deleted if it is still in use by any instance.

[qiancai]

What does "wait for it to be automatically cleaned up after 30 days of inactivity” mean? Will a private endpoint be deleted if it is unused for 30 days even if the corresponding instance is still available?