bug#38818: Dired: mention deleting buffers, not just windows

[積丹尼 Dan Jacobson]

At (info "(emacs) Dired Enter")

   Typing ‘q’ (‘quit-window’) buries the Dired buffer, and deletes its
   window if the window was created just for that buffer.

Add:

  To delete the buffer instead of just burying it, type "1 q".

  To make deleting the buffer the default instead of burying it, use
  (setq ... ...)

  Users might find this helps keeping their buffer-list free of old
  dired buffers crowding.

emacs-version "26.3"