Update D.1.2. The executable war file structure.md

X. Appendices/D.1.2. The executable war file structure.md

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+### D.1.2. 可执行war文件结构
+
+Spring Boot Loader兼容的war文件应该遵循以下结构：
+```java
+example.jar
+ |
+ +-META-INF
+ |  +-MANIFEST.MF
+ +-org
+ |  +-springframework
+ |     +-boot
+ |        +-loader
+ |           +-<spring boot loader classes>
+ +-WEB-INF
+    +-classes
+    |  +-com
+    |     +-mycompany
+    |        +-project
+    |           +-YouClasses.class
+    +-lib
+    |  +-dependency1.jar
+    |  +-dependency2.jar
+    +-lib-provided
+       +-servlet-api.jar
+       +-dependency3.jar
+```
+依赖需要放到内嵌的`WEB-INF/lib`目录下。任何运行时需要但部署到普通web容器不需要的依赖应该放到`WEB-INF/lib-provided`目录下。