Improve classpath index documentation for reproducible builds about spring-boot HOT 3 OPEN

Sorry, I'm not sure what you're suggesting. We already document the fact that the order in the index file matches the order that's used by the build system. What more did you want to see? I'm a little reluctant to mention specifics as there are lots of ways in which a build system's classpath ordering can be changed and we don't want to try to document them all.

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My bad, I am talking about the changes made by this commit: 40a9c4d

It changes the order of the classpath.idx for reproducible builds to alphabetical. I'm suggesting that this should be mentioned in the documentation.

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Thanks. I'd forgotten that Maven doesn't apply reproducible ordering consistently and that there's some logic in its war plugin that we had to replicate. I agree that this is worth documenting if it only applies when packaging and not to when running (spring-boot:run) or testing the application.

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