getParameterDescription = (parameter) => {
    if (!_.isObject(parameter)) {
      return '';
    }

    return (parameter.required ? '(Required) ' : '') + (parameter.description || '') +
      (parameter.enum ? ' (This can only be one of ' + parameter.enum + ')' : '');
  }
Gets the description of the parameter.
If the parameter is required, it prepends a `(Requried)` before the parameter description
If the parameter type is enum, it appends the possible enum values
@param {object} parameter - input param for which description needs to be returned
@returns {string} description of the parameters