Fix typo in Chainer's configuration documentation
Fix typo in Chainer's configuration documentation

ktnyt/chainer,chainer/chainer,okuta/chainer,okuta/chainer,okuta/chainer,chainer/chainer,wkentaro/chainer,keisuke-umezawa/chainer,niboshi/chainer,tkerola/chainer,ronekko/chainer,hvy/chainer,wkentaro/chainer,niboshi/chainer,jnishi/chainer,chainer/chainer,pfnet/chainer,okuta/chainer,kashif/chainer,rezoo/chainer,wkentaro/chainer,niboshi/chainer,jnishi/chainer,keisuke-umezawa/chainer,hvy/chainer,keisuke-umezawa/chainer,wkentaro/chainer,ktnyt/chainer,jnishi/chainer,anaruse/chainer,ktnyt/chainer,ktnyt/chainer,keisuke-umezawa/chainer,jnishi/chainer,aonotas/chainer,hvy/chainer,hvy/chainer,chainer/chainer,niboshi/chainer