nfsd: remove pointless paths in file headers

The new .h files have paths at the top that are now out of date.  While
we're here, just remove all of those from fs/nfsd; they never served any
purpose.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

fs/nfsd/xdr3.h

@@ -1,6 +1,4 @@
 /*
- * linux/include/linux/nfsd/xdr3.h
- *
  * XDR types for NFSv3 in nfsd.
  *
  * Copyright (C) 1996-1998, Olaf Kirch <okir@monad.swb.de>