These come from:
https://docs.docker.com/engine/api/{version}/swagger.yaml
e.g.
https://docs.docker.com/engine/api/v1.29/swagger.yaml
https://docs.docker.com/engine/api/v1.29
The package will always include one reasonably current spec file; currently this is v1.29; this will be the default version
There is mapping of api version to engine version here. I'm currently focussing on 1.29 (supporting engine version 17.05) which is quite recent.
https://docs.docker.com/develop/sdk/#api-version-matrix
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