Fix trailing whitespace

11_compose/11.5_compose_file.md

@@ -459,7 +459,7 @@ services:
       - mysql_data:/var/lib/mysql
 
 volumes:
-  mysql_data:  
+  mysql_data:
 ```
 
 ### 11.5.33 其它指令

11_compose/11.6_django.md

@@ -18,15 +18,15 @@ flowchart TD
             Port8000[":8000"]
             Django ~~~ Port8000
         end
-        
+
         subgraph DB ["db 服务"]
             direction TB
             Postgres["PostgreSQL<br/>数据库"]
         end
-        
+
         Django -- ":5432" --> Postgres
     end
-    
+
     Browser["localhost:8000<br/>（浏览器访问）"]
     Port8000 --> Browser
 ```

11_compose/11.7_rails.md

@@ -18,15 +18,15 @@ flowchart TD
             Port3000[":3000"]
             Rails ~~~ Port3000
         end
-        
+
         subgraph DB ["db 服务"]
             direction TB
             Postgres["PostgreSQL<br/>数据库"]
         end
-        
+
         Rails -- ":5432" --> Postgres
     end
-    
+
     Browser["localhost:3000"]
     Port3000 --> Browser
 ```

11_compose/11.8_wordpress.md

@@ -27,7 +27,7 @@ services:
     image: mysql:8.0
     container_name: wordpress_db
     restart: always
-    command: 
+    command:
       # 使用原生密码认证（旧版 WP 兼容性）
 
       - --default-authentication-plugin=mysql_native_password