docs: removed default model comment and added comment to test (#997)

Author: nayaknishant

automl/snippets/src/main/java/com/example/automl/TranslateCreateModel.java

@@ -46,7 +46,6 @@ static void createModel(String projectId, String datasetId, String displayName)
     try (AutoMlClient client = AutoMlClient.create()) {
       // A resource that represents Google Cloud Platform location.
       LocationName projectLocation = LocationName.of(projectId, "us-central1");
-      // Leave model unset to use the default base model provided by Google
       TranslationModelMetadata translationModelMetadata =
           TranslationModelMetadata.newBuilder().build();
       Model model =

automl/snippets/src/test/java/com/example/automl/TranslateCreateModelTest.java

@@ -76,8 +76,12 @@ public void testTranslateCreateModel() {
           String.format("test_%s", UUID.randomUUID().toString().replace("-", "_").substring(0, 26));
       TranslateCreateModel.createModel(PROJECT_ID, DATASET_ID, modelName);
       String got = bout.toString();
+      // After setting DATASET_ID, change line below to
+      // assertThat(got).contains("Training started...");
       assertThat(got).contains("Dataset does not exist");
     } catch (IOException | ExecutionException | InterruptedException e) {
+      // After setting DATASET_ID, change line below to
+      // assertThat(e.getMessage()).contains("Training started...");
       assertThat(e.getMessage()).contains("Dataset does not exist");
     }
   }