The "Edit on GitHub" button on [ReadTheDocs](http://xarray.pydata.org/en/stable/) is linked to https://github.com/pydata/xarray/blob/origin/stable/doc/index.rst which doesn't exist. The correct URL would be without "origin": https://github.com/pydata/xarray/blob/stable/doc/index.rst