Documentation for FormValidator maybe be inaccurate re: .validate method

[mhavard999]

The docstring in the source and the documentation online for FormValidator both repeatedly mention a .validate method:

    The important method is .validate(), of course.  It gets passed a
    dictionary of the (processed) values from the form.  If you have
    .validate_partial_form set to True, then it will get the incomplete
    values as well -- check with the "in" operator if the form was able
    to process any particular field.

    Anyway, .validate() should return a string or a dictionary.  If a
    string, it's an error message that applies to the whole form.  If
    not, then it should be a dictionary of fieldName: errorMessage.
    The special key "form" is the error message for the form as a whole
    (i.e., a string is equivalent to {"form": string}).

I'm not sure if .validate is meant to collectively stand in for all the different validate methods (i.e. _convert_to_python, _validate_python, _validate_other, etc), and I'm sorry if that is mentioned somewhere in the documentation, but I did get tripped up by it for a little bit when I was trying to sub class FormValidator to make a custom chained_validator.