KCONFIG: In the kernel help for NFSv3 & NFSv4 client support both are

KCONFIG: In the kernel help for NFSv3 & NFSv4 client support both are
   listed as "the newer version ... of the NFS protocol". Obviously
   both can't be the newer version at the same time, so here's a
   patch to correct the text in such a way that only v4 is listed as
   the newer version. Patch is against 2.6.7-rc3 - please consider
   including it.

Signed-off-by: Jesper Juhl <juhl-lkml@dif.dk>
Signed-off-by: Trond Myklebust <trond.myklebust@fys.uio.no>