docs: function createInstanceInjector(cache, providerInjector) {
  	const injector = createInjector(cache, function(servicename) {
  		let provider = providerInjector.get(servicename + PROVIDER_SUFFIX);
  		return injector.invoke(provider.$get, provider);
  	});
  
  	cache.$injector = injector;
  
  	return injector;
  }