nfsd: remove stale comment in nfs4_show_deleg()

As we do now support write delegations, this comment is unhelpful and
misleading.

Reported-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>