Indenting SpringApplication javadoc code

Closes gh-8039

spring-boot/src/main/java/org/springframework/boot/SpringApplication.java

@@ -101,6 +101,7 @@ import org.springframework.web.context.support.StandardServletEnvironment;
  *   public static void main(String[] args) throws Exception {
  *     SpringApplication.run(MyApplication.class, args);
  *   }
+ * }
  * </pre>
  *
  * <p>