springboot Revisit documentation that mentions Gradle "compile" configuration

Hi,

this PR fixes #19794 as discussed + a little polishing for excludes that were in the same example scope.

Cheers, Christoph

Comment From: dreis2211

Test failure seems unrelated

Comment From: wilkinsona

Unrelated and annoying. I've opened https://github.com/spring-projects/spring-boot/issues/19801.