Documentation/filesystems/vfs.txt: remove bogus "Last updated" date

This file has actually been updated over 100 times since the claimed
"Last updated" date.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Documentation/filesystems/vfs.txt

@@ -3,8 +3,6 @@
 
 	Original author: Richard Gooch <rgooch@atnf.csiro.au>
 
-		  Last updated on June 24, 2007.
-
   Copyright (C) 1999 Richard Gooch
   Copyright (C) 2005 Pekka Enberg