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This was brought up in.
Data definitions support descriptions but we do not use descriptions in our configuration schema in core. This would be helpful concretely for auto-generated configuration forms and also generally for making bring configuration schema more inline with field definitions of content entities.
Because config schema arrays get turned into
DataDefinition objects they already support setting a
description key, it is just that we do not do that anywhere in core yet.
Add descriptions to configuration schemas.
Please note (again) that this is not an API change and not even an API addition. The API is already there. Therefore we could also decide to do this step by step or something.