fix(format): unstick bold markers that CJK punctuation kept from rendering

CommonMark only treats a run of asterisks as an emphasis delimiter when it is
left/right-flanking. CJK punctuation counts as Unicode punctuation, so a closer
like `**数据（配比）**相互交织` is preceded by punctuation and followed by a
letter — it cannot close, and the page shows literal asterisks instead of bold.

Inserts the single space that book-rules 1.1 already asks for, on whichever
side was failing: 2 places across 2 file(s). No wording changed —
every diff here is whitespace-only. Verified against pandoc's gfm reader:
each span now renders as its own <strong>.

03_install/3.5_raspberry-pi.md

@@ -185,7 +185,7 @@ For more examples and ideas, visit:
 ```
 若能正常输出以上信息，则说明安装成功。
 
-*注意：*ARM 平台不能使用 `x86` 镜像，查看 Raspberry Pi OS 可使用镜像请访问 [arm32v7](https://hub.docker.com/u/arm32v7/) 或者 [arm64v8](https://hub.docker.com/u/arm64v8/)。
+*注意：* ARM 平台不能使用 `x86` 镜像，查看 Raspberry Pi OS 可使用镜像请访问 [arm32v7](https://hub.docker.com/u/arm32v7/) 或者 [arm64v8](https://hub.docker.com/u/arm64v8/)。
 
 ### 3.5.7 镜像加速
 

12_implementation/12.2_namespace.md

@@ -4,7 +4,7 @@
 
 ### 12.2.1 什么是 Namespace
 
-> **Namespace 是 Linux 内核提供的资源隔离机制，它让容器内的进程仿佛运行在独立的操作系统中。**Namespace 是容器技术的核心基础之一。它回答了一个关键问题：**如何让一个进程 “以为” 自己独占整个系统？**
+> **Namespace 是 Linux 内核提供的资源隔离机制，它让容器内的进程仿佛运行在独立的操作系统中。** Namespace 是容器技术的核心基础之一。它回答了一个关键问题：**如何让一个进程 “以为” 自己独占整个系统？**
 
 ```mermaid
 flowchart LR