; Checkdoc fixes in dired-aux.el

; Checkdoc fixes in dired-aux.el

* lisp/dired-aux.el (dired-compare-directories, dired-do-chmod)
(dired-do-chgrp, dired-do-chown, dired-do-touch)
(dired-minibuffer-default-add-shell-commands)
(dired-read-shell-command, dired-mark-prefix)
(dired-mark-postfix, dired-mark-separator, dired-kill-line)
(dired-reset-subdir-switches, dired-add-entry)
(dired-remove-file)
(dired-create-destination-dirs-on-trailing-dirsep)
(dired-maybe-insert-subdir, dired-tree-up, dired-tree-down):
Checkdoc fixes.