Functions from classes have disappeared from the documentation #934

Description

Normally we can look up the functions of OpenML classes, such as Dataset.get_data()
These have disappeared from the developer documentation:
https://openml.github.io/openml-python/develop/generated/openml.OpenMLDataset.html#openml.OpenMLDataset

They are there in the release docs:
https://openml.github.io/openml-python/master/generated/openml.OpenMLDataset.html#openml.OpenMLDataset

Maybe a problem in Sphinx?

Steps/Code to Reproduce

Check out
https://openml.github.io/openml-python/develop/generated/openml.OpenMLDataset.html#openml.OpenMLDataset

Expected Results

Something like this
https://openml.github.io/openml-python/master/generated/openml.OpenMLDataset.html#openml.OpenMLDataset