Documentation: move nfsroot.txt to filesystems/

Documentation/ is a little large, and filesystems/ seems an obvious
place for this file.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 508e2a2..57709e4 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -845,7 +845,7 @@
 			arch/alpha/kernel/core_marvel.c.
 
 	ip=		[IP_PNP]
-			See Documentation/nfsroot.txt.
+			See Documentation/filesystems/nfsroot.txt.
 
 	ip2=		[HW] Set IO/IRQ pairs for up to 4 IntelliPort boards
 			See comment before ip2_setup() in
@@ -1199,10 +1199,10 @@
 			file if at all.
 
 	nfsaddrs=	[NFS]
-			See Documentation/nfsroot.txt.
+			See Documentation/filesystems/nfsroot.txt.
 
 	nfsroot=	[NFS] nfs root filesystem for disk-less boxes.
-			See Documentation/nfsroot.txt.
+			See Documentation/filesystems/nfsroot.txt.
 
 	nfs.callback_tcpport=
 			[NFS] set the TCP port on which the NFSv4 callback