Fix package declaration of sample in reference docs

Update the "Developing Your First Spring Boot Application" sample so
that the package is not removed.

Closes gh-34513

Author: philwebb

spring-boot-project/spring-boot-docs/src/docs/asciidoc/getting-started/first-application.adoc

@@ -137,6 +137,7 @@ If you run `mvn dependency:tree` again, you see that there are now a number of a
 To finish our application, we need to create a single Java file.
 By default, Maven compiles sources from `src/main/java`, so you need to create that directory structure and then add a file named `src/main/java/MyApplication.java` to contain the following code:
 
+[chomp_package_replacement=com.example]
 include::code:MyApplication[]
 
 Although there is not much code here, quite a lot is going on.