Documentation: move dnotify.txt to filesystems/

I'm inclined to think dnotify belongs in filesystems/.
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
Acked-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Documentation/00-INDEX

@@ -126,8 +126,6 @@ devices.txt
 	- plain ASCII listing of all the nodes in /dev/ with major minor #'s.
 digiepca.txt
 	- info on Digi Intl. {PC,PCI,EISA}Xx and Xem series cards.
-dnotify.txt
-	- info about directory notification in Linux.
 dontdiff
 	- file containing a list of files that should never be diff'ed.
 driver-model/

Documentation/filesystems/00-INDEX

@@ -32,6 +32,8 @@ directory-locking
 	- info about the locking scheme used for directory operations.
 dlmfs.txt
 	- info on the userspace interface to the OCFS2 DLM.
+dnotify.txt
+	- info about directory notification in Linux.
 ecryptfs.txt
 	- docs on eCryptfs: stacked cryptographic filesystem for Linux.
 ext2.txt