Documentation: Not displaying methods for fitters

[eroell]

Hey there!

I noticed that while for some fitters in the documentation, .fit(), .fit_left_censoring, ... are documented;
E.g. KaplanMeierFitter.

But for some other fitters, even though they have these methods too, it is not documented:
E.g. WeibullFitter.

Is this on purpose, or are the docstrings not passing through properly?