code: public ServiceFuture<Void> updateAsync(String personGroupId, UpdatePersonGroupsOptionalParameter updateOptionalParameter, final ServiceCallback<Void> serviceCallback) {
          return ServiceFuture.fromResponse(updateWithServiceResponseAsync(personGroupId, updateOptionalParameter), serviceCallback);
      }
docs: Update an existing person group's display name and userData. The properties which does not appear in request body will not be updated.
  
  @param personGroupId Id referencing a particular person group.
  @param updateOptionalParameter the object representing the optional parameters to be set before calling this API
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object