I notice the Cubase manual(s) use PDF (but I realize Cubase is a more mature product than Dorico).
It would be nice if the Dorico Development Team could use document-management software to produce a PDF-like manual that could be read straight through but also contained (redundant) internal links to related topics.
I also recommend that in addition to step-by-step instructions the manual contain illustrations (annotated where appropriate) that reflect the excellent visual approached the Team has borrowed from the Behind Bars approach to illustrate the various notation Options in Dorico itself.
More on this topic at
Probably best to continue this discussion of manuals there.