docs: update build-environment for the kde-neon and kde-neon-6 extensions
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### What needs to get done
Split the [build-environments](https://canonical-snapcraft.readthedocs-hosted.com/en/latest/reference/extensions/kde-neon-extensions.html#included-build-environment-variables) for kde-neon and kde-neon-6 into core22 and core24 subsections.
### Why it needs to get done
#5261 and #5271 now have a different build-environment, depending if the snap is using a core22 and core24 base.
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