This page has an error:
https://steinberg.help/dorico/v2/en/dorico/topics/write_mode/write_mode_notes_transposing_t.html
To transpose notes and octave up or down the keys are Ctrl/Cmd-ALT-Up/Down and not Ctrl/Cmd-Shift-Up/Down.
Many thanks for your eagle-eyed spotting of this - this error has been corrected and will be updated on the help pages when the next update to the docs is published.