Updating the doc of TestConnectionFactory.

Updating the doc of TestConnectionFactory, which I forgot to do when I
changed the API in a previous CL.

Bug: None
Tbr: rockot@chromium.org
Change-Id: I5b3e6d968b686a8a44f2c0d1561351fec394c5af
Reviewed-on: https://chromium-review.googlesource.com/747888Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Commit-Queue: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512991}

services/service_manager/public/cpp/test/test_connector_factory.h

@@ -21,8 +21,9 @@ class Service;
 // machinery. Typical usage should look something like:
 //
 //     TEST(MyTest, Foo) {
-//       MyServiceImpl impl;  // Your implementation of service_manager::Service
-//       TestConnectorFactory connector_factory(&impl);
+//       // Your implementation of service_manager::Service.
+//       auto impl =  std::make_unique<MyServiceImpl>();
+//       TestConnectorFactory connector_factory(std::move(impl));
 //       std::unique_ptr<service_manager::Connector> connector =
 //           connector_factory.CreateConnector();
 //       RunSomeClientCode(connector.get());
@@ -38,8 +39,7 @@ class Service;
 class TestConnectorFactory {
  public:
   // Constructs a new TestConnectorFactory which creates Connectors whose
-  // requests are routed directly to |service|. |service| is not owned and must
-  // outlive this TestConnectorFactory instance.
+  // requests are routed directly to |service|.
   explicit TestConnectorFactory(std::unique_ptr<Service> service);
   ~TestConnectorFactory();