I downloaded the Resolve 20 package, Installed, Resolve 20, and the PDF Resolve Manual. When I open the Manual file I get the Resolve 19.1 manual. Within the manual it mentions 19.1. With all the updates I would think there would be a new Resolve 20 Manual.
Eventually, they'll rewrite the old manual and combine it with this new feature guide and come up with a Resolve 20 manual. I think we didn't get a Resolve 19 manual until July last year.
They're also in the process of updating all the 18 & 19 training guides, so consider it a "work in progress."
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