Fix docs java configuration(#4605)

[kang-seongbeom]

Solved spring-projects#4605

• Motivation There is nothing in the official document that says that using @EnableBatchProcessing in Spring Boot3 will initialize the configuration. I used @EnableBatchProcessing as explained in the official document, but I had a lot of trouble because the batch operation did not work.
• Modification Add phrase : When using @EnableBatchProcessing in Spring Boot3, default settings are initialized. Therefore, batch operation may not work.