Explain dual properties#255
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Dual properties of categories are largely self-explanatory, whereas dual properties of functors are less so. This has already required additional explanation for the functor properties "left-invertible" and "right-invertible", in particular that taking the dual does not reverse the direction of the functor. That explanation has now been generalized into a dedicated content page. The text "dual property:" on each property detail page (where a dual exists) now links to that page.