update split_lod_tensor, create_array and array_length doc
update split_lod_tensor, create_array and array_length doc

jacquesqiao/Paddle,tensor-tang/Paddle,QiJune/Paddle,PaddlePaddle/Paddle,chengduoZH/Paddle,reyoung/Paddle,baidu/Paddle,QiJune/Paddle,QiJune/Paddle,luotao1/Paddle,baidu/Paddle,jacquesqiao/Paddle,PaddlePaddle/Paddle,chengduoZH/Paddle,jacquesqiao/Paddle,QiJune/Paddle,luotao1/Paddle,tensor-tang/Paddle,luotao1/Paddle,luotao1/Paddle,reyoung/Paddle,chengduoZH/Paddle,baidu/Paddle,luotao1/Paddle,tensor-tang/Paddle,PaddlePaddle/Paddle,jacquesqiao/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,reyoung/Paddle,tensor-tang/Paddle,QiJune/Paddle,chengduoZH/Paddle,PaddlePaddle/Paddle,baidu/Paddle,tensor-tang/Paddle,jacquesqiao/Paddle,reyoung/Paddle,jacquesqiao/Paddle,luotao1/Paddle,QiJune/Paddle,baidu/Paddle,reyoung/Paddle,chengduoZH/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,reyoung/Paddle