It is made by
  C runs the command dired-do-copy (found in dired-mode-map), which is
  an interactive autoloaded compiled Lisp function in ‘dired-aux.el’.

I think it should also mention C-g, "to quit right away".

Sure, "The user is supposed to know that."

But, "He isn't sure it won't cause some damage, else if it were safe, it
would be listed."

emacs-version "26.3"