correct the wrong info node setting in dired-describe-mode

[Aidan Kehoe]

I can't make this change, Mike--you're listed as maintainer, hopefully you
can. 

 Ar an t-ochtú lá de mí Bealtaine, scríobh FKtPp: 

 > hi all,
 > 
 > The following patch makes the 'C-u h' works in dired mode. since xemacs
 > didn't ship a separated dired.info, we have to use (info
 > "(xemacs)Dired") instead of (info "dired").
 > 
 > --- dired-help.el.orig	2008-05-09 09:46:05.171875000 +0800
 > +++ dired-help.el	2008-05-09 09:47:39.468750000 +0800
 > @@ -232,7 +232,8 @@
 >    (interactive "P")
 >    ;; Getting dired documentation can be a bit slow.
 >    (if info
 > -      (info "dired")
 > +      ;; XEmacs specific, xemacs do not have a separate dired.info
 > +      (info "(xemacs)Dired")
 >      (message "Building dired help...")
 >      (let* ((buff (get-buffer-create "*Help*"))
 >  	   (standard-output buff)
 > 
 > 
 > 
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-- 
¿Dónde estará ahora mi sobrino Yoghurtu Nghé, que tuvo que huir
precipitadamente de la aldea por culpa de la escasez de rinocerontes?