code: public ServiceFuture<PersonGroup> getAsync(String personGroupId, final ServiceCallback<PersonGroup> serviceCallback) {
          return ServiceFuture.fromResponse(getWithServiceResponseAsync(personGroupId), serviceCallback);
      }
docs: Retrieve the information of a person group, including its name and userData.
  
  @param personGroupId Id referencing a particular person group.
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object