i18n(ja): fix Cop task mistranslated as police officer

[yahonda]

What is changed, added or deleted? (Required)

TiKV/TiFlash "Cop" (Coprocessor) tasks were mistranslated via the English homonym slang "cop" (police officer): best-practices/tidb-partitioned-tables-best-practices.md's benchmark table header rendered EN "Cop tasks (index scan) / Cop tasks (table lookup) / Total Cop tasks" as "タスクの収集（インデックススキャン）/ 警官タスク（テーブル検索）/ 警官の合計タスク" (task collection / police officer task / police officer's total task), and releases/release-6.5.1.md rendered "the paging in a cop task" as "警官タスクのページング".

Fixed to COP タスク / Cop タスク, matching the already-correct rendering used elsewhere in the same best-practices file's own note: "COP タスクのメトリックは実行計画から派生します。"

Found while independently re-reviewing PR #23810; kept as its own PR since it's an unrelated defect class (literal-identifier mistranslation, not partition-type naming).

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

• i18n-ja-release-8.5 (TiDB Japanese documentation for TiDB 8.5 versions)

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

• This PR is translated from:
• Other reference link(s):

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
  • Corrected Japanese terminology for coprocessor (Cop) tasks in the partitioned tables best-practices guide and release notes.
  • Corrected the StreamNative alternative link text and Japanese phrasing in the TiCDC removed-features documentation.

[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 a2da298 and fa2d062.

📒 Files selected for processing (3)

• best-practices/tidb-partitioned-tables-best-practices.md
• releases/release-6.3.0.md
• releases/release-6.5.1.md

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📝 Walkthrough

Walkthrough

The changes correct Japanese terminology and wording in a partitioned-tables best-practices guide and two release notes. No code or public entity declarations changed.

Changes

Documentation terminology corrections

Layer / File(s)	Summary
Terminology and wording corrections best-practices/tidb-partitioned-tables-best-practices.md, releases/release-6.3.0.md, releases/release-6.5.1.md	Updated references to COP tasks, corrected the StreamNative kop link text, and added the required Japanese particle in the TiCDC note.

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

Suggested reviewers: qiancai

Merge Risk: ⚪ Minimal · up to 1e106

Japanese documentation now uses accurate Cop/COP task and kop terminology without changing product behavior or release-note meaning. No current merge-readiness risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: correcting the Japanese mistranslation of Cop tasks as police officers.
Description check	✅ Passed	The description explains the changes, affected documentation version, AI involvement, and scope. The required sections are substantially complete; blank optional reference-link fields do not prevent r…
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 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[LGTM Timeline notifier]

Timeline:

• 2026-09-10 05:55:47.589424831 +0000 UTC m=+1949982.760519054: ☑️ agreed by qiancai.