Error in documentation for ProbitLogNormal class

[Puzzled-Face]

The documentation for the ProbitLogNormal class reads, in part,

This model is also used in the DualEndpoint classes...

which is not strictly true, because DualEndpoint supports both ProbitNormal [a class which does not exist] and ProbitLogNormal models through its use_log_dose slot. ProbitLogNormal has no such flag, so always uses log(x/x*) as a covariate in its model.

Suggestions

• Amend the documentation for ProbitLogNormal to clarify that DualEndpoint's model is an extension of ProbitLogNormal.
• [Optional] Create a ProbitNormal class to implement the missing model

Creation of the ProbitNormal class (and associated methods) should be straightforward, and would help with the implementation of knit_print methods for model classes. (See #796.) However, note that the name suggested here contradicts the nomenclature used in LogisticLogNormal and LogisticNormal, where the presence or absence of Log defines the prior, not the covariate.