Fix trailing whitespace

08_data/8.2_bind-mounts.md

@@ -9,11 +9,11 @@ flowchart LR
     subgraph Host ["宿主机"]
         Dir1["/home/user/code/"]
     end
-    
+
     subgraph Container ["容器"]
         Dir2["/usr/share/nginx/html/"]
     end
-    
+
     Dir1 <-->|Bind Mount| Dir2
 ```
 目录结构（同一份文件）：
@@ -210,7 +210,7 @@ $ docker inspect mycontainer --format '{{json .Mounts}}' | jq
 
 ```bash
 $ docker run --mount type=bind,source=/not/exist,target=/app nginx
-docker: Error response from daemon: invalid mount config for type "bind": 
+docker: Error response from daemon: invalid mount config for type "bind":
 bind source path does not exist: /not/exist
 ```
 **解决**：确保源路径存在，或改用 `-v` (会自动创建)