Document RegisterMapper split into Register(Row|Column)Mapper in v2 to v3 guide. And other cosmetic improvements to doc.
Document RegisterMapper split into Register(Row|Column)Mapper in v2 to v3 guide. And other cosmetic improvements to doc.

john9x/jdbi,john9x/jdbi,jdbi/jdbi,hgschmie/jdbi,hgschmie/jdbi,jdbi/jdbi,jdbi/jdbi,hgschmie/jdbi