code: func (client *Client) DeleteServiceInstanceRelationshipsSharedSpace(serviceInstanceGUID string, spaceGUID string) (Warnings, error) {
  	request, err := client.newHTTPRequest(requestOptions{
  		RequestName: internal.DeleteServiceInstanceRelationshipsSharedSpaceRequest,
  		URIParams:   internal.Params{"service_instance_guid": serviceInstanceGUID, "space_guid": spaceGUID},
  	})
  	if err != nil {
  		return nil, err
  	}
  
  	response := cloudcontroller.Response{}
  	err = client.connection.Make(request, &response)
  	return response.Warnings, err
  }
docs: // DeleteServiceInstanceRelationshipsSharedSpace will delete the sharing relationship
  // between the service instance and the shared-to space provided.