docs: add code PR field to pull request template

[qiancai]

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

Add a dedicated field for related code change PRs to the pull request template. The new guidance asks contributors to provide the corresponding code PR when a documentation update is related to a code change, helping reviewers verify that documented behavior matches the implementation.

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

• 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(s) (if applicable):
• This PR is translated from:
• Other reference link(s): docs: add code PR field to pull request template docs-cn#21916

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

• Documentation
  • Updated the pull request template wording and punctuation to make change descriptions clearer.
  • Clarified when documentation updates should reference related code changes.
  • Added a dedicated bullet for linking related code change pull requests.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Team

Run ID: 11aa8d77-78cc-42c7-ac6b-c5445fe7ec81

📥 Commits

Reviewing files that changed from the base of the PR and between 359ff26 and bc6ccf1.

📒 Files selected for processing (1)

• .github/pull_request_template.md

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

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📝 Walkthrough

Walkthrough

The pull request template updates heading punctuation and expands the reference-links section with guidance and a field for related code change pull requests.

Changes

Pull Request Template

Layer / File(s)	Summary
Template wording and reference links .github/pull_request_template.md	The change heading adds a comma. The reference-links comment now covers related code changes and adds a corresponding pull request field.

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

Merge Risk: ⚪ Minimal · up to bc6cc

This updates pull request guidance to request related code-change links for documentation updates. The change is ready to merge with no identified product or runtime risk.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a code PR field to the pull request template.
Description check	✅ Passed	The description covers the required change, affected TiDB version, related links, AI involvement, and change classification. It also explains why the new code PR field is needed.
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 PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Team

Run ID: 3e7fa7cb-8a2d-4d38-8793-7848bd93597c

📥 Commits

Reviewing files that changed from the base of the PR and between 49887c1 and 359ff26.

📒 Files selected for processing (1)

• .github/pull_request_template.md

Included review availability: Your plan provides up to 4 included reviews per hour; 1 remains after this review.

[qiancai]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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• OWNERS [qiancai]

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