Documentation has warnings in output

In https://ipfx.readthedocs.io/en/latest/ipfx.html#module-ipfx.sweep I see

```
System Message: WARNING/2 (/home/docs/checkouts/readthedocs.org/user_builds/ipfx/checkouts/latest/ipfx/sweep.py:docstring of ipfx.sweep.Sweep, line 29)
toctree references unknown document ‘ipfx.sweep.Sweep.detect_epochs’
```

and a lot of other places.