Show how to extract p-values etc. in package documentation

[OkonSamuel]

As discussed in issue #36 some users may wish to get the p-values from the glm models. I believe we should show how to do this in the model docstrings.

see #36 (comment)

[rikhuijzer]

The main confusion for me was that I usually don't need to use report and can just find the required information on the fitted machine via mach |> typeof |> fieldnames and selecting the appropriate field.

EDIT: But I think it's currently okay. I should have looked a bit further probably. This package is not used so much and doing frequentists statistics and machine learning at the same time is not so common, so there is not much need for big changes here.

Let's close?