code: public Docket directModelSubstitute(final Class clazz, final Class with) {
      this.ruleBuilders.add(newSubstitutionFunction(clazz, with));
      return this;
    }
docs: Directly substitutes a model class with the supplied substitute
  e.g
  <code>directModelSubstitute(LocalDate.class, Date.class)</code>
  would substitute LocalDate with Date
  
  @param clazz class to substitute
  @param with  the class which substitutes 'clazz'
  @return this Docket