i18n(ja): unify window function link text

[yahonda]

What is changed, added or deleted? (Required)

sql-statements/sql-statement-select.md's Window window_definition row used 機能 (feature) in its link text to functions-and-operators/window-functions.md, while both the EN source ("Window Function") and the surrounding JA prose in the same table cell correctly use 関数 (function). This was the sole occurrence of this link text with 機能 in the corpus — 28 other links to the same page already correctly say ウィンドウ関数.

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
  • Updated the reference link for window functions to point to the “Window Functions” documentation.

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📥 Commits

Reviewing files that changed from the base of the PR and between a82e814 and 647e124.

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• sql-statements/sql-statement-select.md

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📝 Walkthrough

Walkthrough

ウィンドウ関数の詳細ページへのリンク表示名を「ウィンドウ関数」に変更しました。

Changes

ウィンドウ関数リンク

Layer / File(s)	Summary
リンク表示名の更新 sql-statements/sql-statement-select.md	リンク表示名を「ウィンドウ機能」から「ウィンドウ関数」に変更しました。

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

Merge Risk: ⚪ Minimal · up to 647e1

This updates the Japanese window-functions link label for consistency without changing link behavior or product functionality. No merge-readiness risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description check	✅ Passed	The description explains the exact file and text change, gives the reason, identifies the applicable Japanese TiDB 8.5 branch, and records AI involvement. The translation and reference-link fields are…
Title check	✅ Passed	The title clearly and concisely identifies the Japanese internationalization change and the link-text unification. It matches the primary change in the pull request.
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: Description check

Explanation

The description explains the exact file and text change, gives the reason, identifies the applicable Japanese TiDB 8.5 branch, and records AI involvement. The translation and reference-link fields are blank, but they are not critical for this small documentation correction.

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. (1 skipped: 1 unsupported.)

✨ 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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