fix: correct DDE help manual format for proper recognition

[mhduiy]

Changed the title format in both English and Traditional Chinese DDE help manual files from "Desktop Environment|DDE" to "Desktop Environment|dde|" and from "桌面環境|DDE|" to "桌面環境|dde|". The format needed to be corrected so that the help system can properly recognize it as a desktop environment manual. The key change was adding the missing trailing pipe character in the English version and ensuring consistent lowercase "dde" identifier in both versions.

Log: Fixed DDE help manual format for proper system recognition

fix: 修正 DDE 帮助手册格式以便正确识别

将英文和繁体中文 DDE 帮助手册文件中的标题格式从 "Desktop Environment|
DDE" 改为 "Desktop Environment|dde|"，从 "桌面環境|DDE|" 改为 "桌面環境| dde|"。需要修正此格式以便帮助系统能够正确识别其为桌面环境手册。主要更改
是在英文版本中添加了缺失的尾部管道字符，并确保两个版本都使用一致的小写
"dde" 标识符。

Log: 修正了 DDE 帮助手册格式以便系统正确识别

PMS: BUG-355921

Summary by Sourcery

Documentation:

• Update English and Traditional Chinese DDE help manual titles to use the correct lowercase dde identifier and required trailing separator for system recognition.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates the DDE help manual titles in English and Traditional Chinese to use the correctly formatted, lowercase "dde" identifier and ensure the trailing pipe is present so the help system recognizes them as desktop environment manuals.

Flow diagram for help system recognition of DDE manuals

flowchart TD
  A[Load help manual file] --> B[Read first heading line]
  B --> C[Parse title segments split by pipe]
  C --> D{Second segment equals dde?}
  D -->|No| E[Manual not tagged as desktop environment]
  D -->|Yes| F{Title ends with trailing pipe?}
  F -->|No| E
  F -->|Yes| G[Tag manual as desktop environment]
  G --> H[Expose in DDE desktop environment help category]

  %% Context for this PR
  subgraph Before_PR[Before this PR]
    C -.-> D_before{Second segment equals DDE}
    D_before -->|Case mismatch| E
  end

  subgraph After_PR[After this PR]
    C -.-> D_after{Second segment equals dde and trailing pipe present}
    D_after --> G
  end

Loading

File-Level Changes

Change	Details	Files
Normalize DDE help manual title format for system recognition.	Change English manual title from using "DDE" without trailing pipe to lowercase "dde" with a trailing pipe delimiter. Change Traditional Chinese manual title from uppercase "DDE" with trailing pipe to lowercase "dde" with trailing pipe to match the expected identifier format.	src/assets/dde/en_US/d_dde.md src/assets/dde/zh_TW/d_dde.md

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[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mhduiy, wjyrich

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