ci(spanner): Fix sample tests related to asymmetric autoscaling (#3657)

Author: sakthivelmanii

samples/snippets/src/main/java/com/example/spanner/CreateInstanceWithAsymmetricAutoscalingConfigExample.java

@@ -90,7 +90,7 @@ static void createInstance(String projectId, String instanceId) {
                 .setInstanceId(instanceId)
                 .setInstance(instance)
                 .build()).get();
-        System.out.printf("Autoscaler instance %s was successfully created%n",
+        System.out.printf("Asymmetric Autoscaling instance %s was successfully created%n",
             instanceResult.getName());
       } catch (ExecutionException e) {
         System.out.printf(