Document the properties used by spring-boot-dependencies to control dependency versions

[wilkinsona]

We have an appendix that documents groupId, artifactId, and version for all of the dependencies managed by spring-boot-dependencies. I think it would also be useful to document the version property, if any, that determines each version. It would make things easier for users who want to override a dependency version.

I'm not 100% sure that the is possible due to bom imports and our current approach of extracting the versions from the effective pom, by which point the version properties have been lost.

[codebuster007]

Hi! @wilkinsona ,

I'd like to know if this issue has been resolved or assigned to anyone because I'll love to work on it.

Thanks.

[wilkinsona]

Thanks very much for the offer, @codebuster007. This has been implemented in #19898 but we forgot to close this issue. I'll do that now.