LogisticregressionCV doesn't document shape of C_ properly

[amueller]

http://scikit-learn.org/dev/modules/generated/sklearn.linear_model.LogisticRegressionCV.html#sklearn.linear_model.LogisticRegressionCV

says

C_ : array, shape (n_classes,) or (n_classes - 1,)

    Array of C that maps to the best scores across every class. If refit is set to False, then for each class, the best C is the average of the C’s that correspond to the best scores for each fold.

but it doesn't say when it would be either shape. I think it should.

[aashil]

I would like to work on this one.