Fix some typos in documentations
Fix some typos in documentations

wavelets/chainer,AlpacaDB/chainer,chainer/chainer,tigerneil/chainer,ronekko/chainer,AlpacaDB/chainer,wkentaro/chainer,okuta/chainer,chainer/chainer,keisuke-umezawa/chainer,laysakura/chainer,benob/chainer,muupan/chainer,t-abe/chainer,t-abe/chainer,yanweifu/chainer,wkentaro/chainer,jnishi/chainer,hvy/chainer,truongdq/chainer,okuta/chainer,Kaisuke5/chainer,sinhrks/chainer,chainer/chainer,ikasumi/chainer,minhpqn/chainer,ysekky/chainer,umitanuki/chainer,kikusu/chainer,tkerola/chainer,muupan/chainer,ytoyama/yans_chainer_hackathon,wkentaro/chainer,delta2323/chainer,pfnet/chainer,cupy/cupy,ktnyt/chainer,jnishi/chainer,niboshi/chainer,woodshop/complex-chainer,ktnyt/chainer,okuta/chainer,kashif/chainer,aonotas/chainer,hidenori-t/chainer,tscohen/chainer,woodshop/chainer,cupy/cupy,hvy/chainer,okuta/chainer,kuwa32/chainer,niboshi/chainer,1986ks/chainer,ktnyt/chainer,sinhrks/chainer,rezoo/chainer,ktnyt/chainer,cupy/cupy,jnishi/chainer,wkentaro/chainer,chainer/chainer,sou81821/chainer,cupy/cupy,cemoody/chainer,anaruse/chainer,keisuke-umezawa/chainer,niboshi/chainer,hvy/chainer,masia02/chainer,kiyukuta/chainer,niboshi/chainer,kikusu/chainer,keisuke-umezawa/chainer,hvy/chainer,keisuke-umezawa/chainer,truongdq/chainer,jnishi/chainer,benob/chainer