code: static LogoutUrlBuilder newInstance(HttpUrl baseUrl, String clientId, String returnToUrl, boolean setClientId) {
          return new LogoutUrlBuilder(baseUrl, setClientId ? clientId : null, returnToUrl);
      }
docs: Creates a instance of the {@link LogoutUrlBuilder} using the given domain and base parameters.
  
  @param baseUrl     the base url constructed from a valid domain.
  @param clientId    the application's client_id value to set
  @param returnToUrl the returnTo value to set. Must be already URL Encoded and must be white-listed in your Auth0's dashboard.
  @param setClientId whether the client_id value must be set or not. This affects the white-list that the Auth0's Dashboard uses to validate the returnTo url.
  If the client_id is set, the white-list is read from the Application's settings. If the client_id is not set, the white-list is read from the Tenant's settings.
  @return a new instance of the {@link LogoutUrlBuilder} to configure.