Update jtag_debug_user_guide

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📄 Bilingual Docs Check

✅ All changed files have both zh and en counterparts

Changed files in this PR

File	EN	ZH
user_guide/jtag_debug_user_guide.md	✅	✅

✅ updated in this PR   📁 exists but not updated   ❌ file missing

No parity issues detected. 🎉

---

This check is informational and does not block merging.

💡 Doc Engineering Suggestions

Up to 5 suggestions per language for changed files in this PR.

zh/user_guide/jtag_debug_user_guide.md （中文）

• 建议为代码块添加语言标签（如```bash、```yaml），方便读者识别和语法高亮。
• 文档缺少 frontmatter（--- 块），建议补充 sidebar_position 等元数据。
• 顶级章节后缺少引导性说明段落，建议在第一个小节前加一两句概述，帮助读者理解上下文。
• 文档内容较多但未使用任何提示框（如 > 注意：），对关键注意事项建议使用 blockquote 或 admonition 标注。

en/user_guide/jtag_debug_user_guide.md (English)

• Add a language tag to fenced code blocks (e.g. ```bash, ```yaml) for syntax highlighting and readability.
• Document is missing frontmatter (--- block). Consider adding sidebar_position and other metadata.
• No introductory paragraph found before the first subsection. Add a brief overview to orient the reader.
• No callouts (NOTE / WARNING / TIP) found in a multi-section document. Consider highlighting critical information with blockquotes or admonition syntax.