fluid.io don't show in the website

[luotao1]

In http://www.paddlepaddle.org/docs/develop/documentation/zh/api/v2/fluid.html, there is no fluid.io for https://github.com/PaddlePaddle/Paddle/blob/develop/python/paddle/v2/fluid/io.py. Thus, we can't find the explanation of load_inference_model and save_inference_model.

[kavyasrinet]

I can look into this.

[kavyasrinet]

Still working on this, as of now, the docker build fails (this issue is being worked on: #7459