Update 23.5. Placeholders in properties.md

IV. Spring Boot features/23.5. Placeholders in properties.md

@@ -5,4 +5,4 @@
 app.name=MyApp
 app.description=${app.name} is a Spring Boot application
 ```
-**注**：你也能使用相应的技巧为存在的Spring Boot属性创建'短'变量，具体参考[Section 63.3, “Use ‘short’ command line arguments”](http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#howto-use-short-command-line-arguments)。
+**注**：你也能使用相应的技巧为存在的Spring Boot属性创建'短'变量，具体参考[Section 63.3, “Use ‘short’ command line arguments”](../IX. ‘How-to’ guides/63.3. Use ‘short’ command line arguments.md)。