* dired.texi (Dired): Mention C-x C-d too.

* dired.texi (Dired): Mention C-x C-d too.
(Dired Enter): Document M-n in the Dired minibuffer.
(Dired Navigation): Explain dired-goto-file more clearly.  Document
dired-isearch-filenames.
(Dired Deletion): Remove unnecessary "expunged" terminology.
(Flagging Many Files): & is now rebound to `% &'.
(Shell Commands in Dired): Document dired-do-async-shell-command.
Clarify how multi-file arguments are passed.
(Misc Dired Features): Document dired-do-isearch.