Reference docs: Nearly empty page for pandas.DataFrame.plot
The web page
https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.DataFrame.plot.html

is essentially empty. It should, instead, include the content from
https://pandas.pydata.org/pandas-docs/version/0.23/generated/pandas.DataFrame.plot.html
![Screen Shot 2019-08-04 at 17 03 33](https://user-images.githubusercontent.com/703084/62431177-e05f2100-b6d9-11e9-880e-a06dbf09fe0a.png)

![Screen Shot 2019-08-04 at 17 03 51](https://user-images.githubusercontent.com/703084/62431178-e523d500-b6d9-11e9-9ede-693d17a92a88.png)

