Fix JUnit javadoc links

[ngocnhan-tran1996]

JUnit javadoc links go to page 404

The native image also includes the JUnit TestEngine configured with a list of the discovered tests.

Reference
https://docs.spring.io/spring-boot/3.4-SNAPSHOT/how-to/native-image/testing-native-applications.html

...is a JUnit Extension that you can use to capture...

Reference
https://docs.spring.io/spring-boot/3.4-SNAPSHOT/reference/testing/test-utilities.html

...method of the helper in your @BeforeEach method if you do not use...

Reference
https://docs.spring.io/spring-boot/3.4-SNAPSHOT/reference/testing/spring-boot-applications.html

[mhalbritter]

Thanks @ngocnhan-tran1996 !