Fix some words and add an explanation on generic coding
Fix some words and add an explanation on generic coding

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