This reverts commit 8ba38e07.

* update 1.8 apis, test=develop

* udpate contents, test=develop

* add cn doc of trace API & diag_embed API (#2039)

* add cn doc of trace API

* add cn doc of diag_embed API

* add cn doc of diag_embed & trace API

* add bmm arange api_doc test=develop

* Add randperm cn doc, test=develop, test=document_preview

* add doc for kron op, test=document_preview

* add support for integer types, test=document_preview

* add cross, roll, index_select, nonzero api_cn

* test=document, add cross,index_select,nonzero,roll cn doc

* test=document, bug fix for syntax error

* add paddle.sin, sqrt, tanh, atan cn doc to fluid docs

* Add Chinese document of API: randn

paddle.add doc for elementwise_add operator 
paddle.div doc for elementwise_div operator 

add the the mul and pow api to the fluid tensor doc 

* add cn doc for dot and logsumexp

add the chinese doc of paddle.norm and the preview doc 

add Chinese doc in ops(sum, zeros, zeros_like, ones, ones_like, mm, elemenwise_equal, elememtwise_sum, sort, argmax)

add Chinese doc in ops(sum, zeros, zeros_like, ones, ones_like, mm, elemenwise_equal, elememtwise_sum, sort, argmax)

* add eye,t,min,max,log1p API doc_cn; test=develop

* change cn.rst

* change cn.rst

* add api_cn

* test=develop

* add paddle.tensor

* add