code: public void update(String personGroupId, UUID personId, UpdatePersonGroupPersonsOptionalParameter updateOptionalParameter) {
          updateWithServiceResponseAsync(personGroupId, personId, updateOptionalParameter).toBlocking().single().body();
      }
docs: Update name or userData of a person.
  
  @param personGroupId Id referencing a particular person group.
  @param personId Id referencing a particular person.
  @param updateOptionalParameter the object representing the optional parameters to be set before calling this API
  @throws IllegalArgumentException thrown if parameters fail the validation
  @throws APIErrorException thrown if the request is rejected by server
  @throws RuntimeException all other wrapped checked exceptions if the request fails to be sent