def update(person_group_id, name:nil, user_data:nil, custom_headers:nil)
      response = update_async(person_group_id, name:name, user_data:user_data, custom_headers:custom_headers).value!
      nil
    end
def update(person_group_id, name:nil, user_data:nil, custom_headers:nil)
      response = update_async(person_group_id, name:name, user_data:user_data, custom_headers:custom_headers).value!
      nil
    end
Update an existing person group's display name and userData. The properties
 which does not appear in request body will not be updated.

 @param person_group_id [String] Id referencing a particular person group.
 @param name [String] User defined name, maximum length is 128.
 @param user_data [String] User specified data. Length should not exceed 16KB.
 @param custom_headers [Hash{String => String}] A hash of custom headers that
 will be added to the HTTP request.