* Add the argmax, argmin api doc for the api 2.0, test=develop

* add uniform op doc

* fix uniform en format

* delete useless code

* refine sign tanh api, test=develop

* Add Tanh, test=develop

* fix en, test=develop

* rename the inputs and update code example, test=develop

* update doc

* Add the max, min, maximum, minimum api for the paddle 2.0

update the api doc for the cumsum op 

 Fix the compare ops doc for the api2.0

Fix the argsort, sort the api doc for paddle2.0

fix cross op doc for API2.0

* Add Chinese document of API: randn

* add api_cn

* test=develop

* add paddle.tensor

* add