Update docstrings in validphys with new datasets names

[kamillaurent]

I am still not sure when to add "variant": "legacy" and "frac": 0.75 when switching names.

[scarlehoff]

In general, if you are not doing a fit, then the fraction is not needed (since it is the training/validation split)

RE legacy, use the variant that is used in the 4.1 runcard. If, for whataver reason, it cannot be used (e.g. it is an example that only runs for older theories and data for some reason) then use legacy.

[kamillaurent]

Regarding datasets that are not in the dataset_names.yml (i.e. NTVNUDMNFe from validphys2/src/validphys/n3fit_data.py), should I remove them or should I change them with the closest name (in this case NTVNUDMNFe_dw_ite)?

[scarlehoff]

should I remove them or should I change them with the closest name (in this case NTVNUDMNFe_dw_ite)?

I'd say the closest one.

But again, if it is an exmaple, you can choose a different dataset and make sure that the example is showing the same.