nfs: move more to Documentation/filesystems/nfs

Oops: I missed two files in the first commit that created this
directory.
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>

Documentation/filesystems/00-INDEX

@@ -84,8 +84,6 @@ relay.txt
 	- info on relay, for efficient streaming from kernel to user space.
 romfs.txt
 	- description of the ROMFS filesystem.
-rpc-cache.txt
-	- introduction to the caching mechanisms in the sunrpc layer.
 seq_file.txt
 	- how to use the seq_file API
 sharedsubtree.txt

Documentation/filesystems/nfs/00-INDEX

@@ -2,6 +2,8 @@
 	- this file (nfs-related documentation).
 Exporting
 	- explanation of how to make filesystems exportable.
+knfsd-stats.txt
+	- statistics which the NFS server makes available to user space.
 nfs.txt
 	- nfs client, and DNS resolution for fs_locations.
 nfs41-server.txt
@@ -10,3 +12,5 @@ nfs-rdma.txt
 	- how to install and setup the Linux NFS/RDMA client and server software
 nfsroot.txt
 	- short guide on setting up a diskless box with NFS root filesystem.
+rpc-cache.txt
+	- introduction to the caching mechanisms in the sunrpc layer.