Update basic tutorial wording
Update basic tutorial wording

keisuke-umezawa/chainer,hvy/chainer,okuta/chainer,ktnyt/chainer,ktnyt/chainer,kikusu/chainer,chainer/chainer,niboshi/chainer,jnishi/chainer,okuta/chainer,cupy/cupy,delta2323/chainer,ronekko/chainer,kiyukuta/chainer,niboshi/chainer,cupy/cupy,okuta/chainer,wkentaro/chainer,chainer/chainer,aonotas/chainer,ktnyt/chainer,hvy/chainer,okuta/chainer,cupy/cupy,jnishi/chainer,kikusu/chainer,chainer/chainer,wkentaro/chainer,pfnet/chainer,rezoo/chainer,jnishi/chainer,niboshi/chainer,tkerola/chainer,keisuke-umezawa/chainer,hvy/chainer,wkentaro/chainer,anaruse/chainer,chainer/chainer,kashif/chainer,wkentaro/chainer,ktnyt/chainer,cupy/cupy,niboshi/chainer,keisuke-umezawa/chainer,ysekky/chainer,jnishi/chainer,keisuke-umezawa/chainer,hvy/chainer