Update docs/source/reference/initializers.rst
Update docs/source/reference/initializers.rst

Co-Authored-By: Crissman <160bd374915d308f01dbfbffd6caceec5ca36178@preferred.jp>
niboshi/chainer,niboshi/chainer,keisuke-umezawa/chainer,tkerola/chainer,keisuke-umezawa/chainer,okuta/chainer,okuta/chainer,chainer/chainer,pfnet/chainer,hvy/chainer,chainer/chainer,niboshi/chainer,niboshi/chainer,jnishi/chainer,jnishi/chainer,hvy/chainer,hvy/chainer,chainer/chainer,keisuke-umezawa/chainer,okuta/chainer,keisuke-umezawa/chainer,okuta/chainer,wkentaro/chainer,hvy/chainer,wkentaro/chainer,chainer/chainer,jnishi/chainer,wkentaro/chainer,wkentaro/chainer,jnishi/chainer