Where's the actual documentation for the hassio API?

I’m trying to find out what the parameters for a function like hass.services.call are and do. I expected to find them somewhere in the Home Assistant Developer Docs. Among them is the hass object, which contains a table listing hass, hass.config, hass.states, hass.bus and hass.services with respective promising links to “See available methods.”
But non of the pages the links lead to contain ANY documentation of methods (in a form you’d expect it from an API documentation). Two of the links even just lead back to the developer docs index page. Also all Google and forum searches lead me back to the same “Developer Docs” that IMHO don’t describe it at all.
Got those links lost in translation somewhere? With links named “See available methods.” I expect the documents to exist somewhere…

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There used to be a document however it was removed at some point. The api changes so often that it would need to be a living document with lots of care. Your best options are to read the function docs through VSCode, or ask questions on discord dev support channel.