sql: document unsupported GRANT PROXY in MySQL compatibility

[doc-claw-bot]

What is changed, added or deleted? (Required)

• Add the corresponding Chinese MySQL compatibility note to sql-statements/sql-statement-grant-privileges.md to clarify that TiDB does not support GRANT PROXY.
• This update is scoped to release-8.5 because it documents the currently published behavior verified in TiDB Cloud Starter.

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

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v8.5 (TiDB 8.5 versions)
• v8.4 (TiDB 8.4 versions)
• v8.3 (TiDB 8.3 versions)
• v8.2 (TiDB 8.2 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)?

• This PR is translated from: sql: document unsupported GRANT PROXY in MySQL compatibility docs#23742
• Other reference link(s): https://docs.pingcap.com/tidb/stable/sql-statement-grant-privileges/

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

• 文档
  • 在 GRANT <privileges> 的“MySQL 兼容性”部分补充说明：TiDB 不支持 GRANT PROXY 语句。

[ti-chi-bot]

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[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: a541fd74-0623-4022-9ba2-844a1d3e8c4e

📥 Commits

Reviewing files that changed from the base of the PR and between 0b6ace9 and 88fad62.

📒 Files selected for processing (1)

• sql-statements/sql-statement-grant-privileges.md

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📝 Walkthrough

Walkthrough

更新 GRANT <privileges> 文档的 MySQL 兼容性说明，明确 TiDB 不支持 GRANT PROXY 语句。

Changes

GRANT 权限语句文档

Layer / File(s)	Summary
补充 GRANT PROXY 兼容性说明 sql-statements/sql-statement-grant-privileges.md	在“MySQL 兼容性”列表中新增说明：TiDB 不支持 GRANT PROXY。

Estimated code review effort: 1（简单） | ~2 分钟

Merge Risk: ⚪ Minimal · up to 88fad

This updates the Chinese GRANT compatibility note to state that TiDB does not support GRANT PROXY. No current merge-readiness risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	标题准确概括了主要变更：在 MySQL 兼容性文档中说明 TiDB 不支持 GRANT PROXY。标题简洁且具体。
Description check	✅ Passed	描述包含变更内容、适用版本、相关 PR 和文件链接、AI 参与情况及变更类型检查项。描述说明了变更原因，并明确将范围限定为 v8.5。整体符合模板要求。
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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