Show default values on the Documentation

[osbm]

In the documentation page for the CatBoostRegressor there are no default values of parameters or explanations on parameters shown except for the loss_function parameter. It is very hard to learn what a parameters does. Sometimes even adding the default help guess what are other viable values. For example you guess that the loss_function='MAE' parameter just expects the abbreviation of the name of the metric as a string.

Thank you :)

[andrey-khropov]

We will reformat this documentation page to make it clearer, somehow the formatting went a bit off.

Actually you can see all the the details about the training params in the special Training parameters section.