microgen: add missing comma in datastransfer row

Change-Id: Iaf13f2de8bbf46a4f658f6f33b8090520324117c
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/49050
Reviewed-by: Cody Oss <codyoss@google.com>
diff --git a/microgens.csv b/microgens.csv
index db69720..499119a 100644
--- a/microgens.csv
+++ b/microgens.csv
@@ -8,7 +8,7 @@
 google/cloud/scheduler/v1beta1, --go-gapic-package cloud.google.com/go/scheduler/apiv1beta1;scheduler, --grpc-service-config google/cloud/scheduler/v1beta1/cloudscheduler_grpc_service_config.json, --gapic-service-config google/cloud/scheduler/v1beta1/cloudscheduler_v1beta1.yaml, --release-level beta
 google/cloud/speech/v1, --go-gapic-package cloud.google.com/go/speech/apiv1;speech, --grpc-service-config google/cloud/speech/v1/speech_grpc_service_config.json, --gapic-service-config google/cloud/speech/v1/speech_v1.yaml,
 google/cloud/speech/v1p1beta1, --go-gapic-package cloud.google.com/go/speech/apiv1p1beta1;speech, --grpc-service-config google/cloud/speech/v1p1beta1/speech_grpc_service_config.json, --gapic-service-config google/cloud/speech/v1p1beta1/speech_v1p1beta1.yaml, --release-level beta
-google/cloud/bigquery/datatransfer/v1, --go-gapic-package cloud.google.com/go/bigquery/datatransfer/apiv1;datatransfer, --grpc-service-config google/cloud/bigquery/datatransfer/v1/bigquerydatatransfer_grpc_service_config.json, --gapic-service-config google/cloud/bigquery/datatransfer/v1/bigquerydatatransfer_v1.yaml --release-level alpha
+google/cloud/bigquery/datatransfer/v1, --go-gapic-package cloud.google.com/go/bigquery/datatransfer/apiv1;datatransfer, --grpc-service-config google/cloud/bigquery/datatransfer/v1/bigquerydatatransfer_grpc_service_config.json, --gapic-service-config google/cloud/bigquery/datatransfer/v1/bigquerydatatransfer_v1.yaml, --release-level alpha
 google/cloud/bigquery/storage/v1beta1, --go-gapic-package cloud.google.com/go/bigquery/storage/apiv1beta1;storage, --grpc-service-config google/cloud/bigquery/storage/v1beta1/bigquerystorage_grpc_service_config.json, --gapic-service-config google/cloud/bigquery/storage/v1beta1/bigquerystorage_v1beta1.yaml, --release-level beta
 google/cloud/iot/v1, --go-gapic-package cloud.google.com/go/iot/apiv1;iot, --grpc-service-config google/cloud/iot/v1/cloudiot_grpc_service_config.json, --gapic-service-config google/cloud/iot/v1/cloudiot_v1.yaml,
 google/cloud/recommender/v1beta1, --go-gapic-package cloud.google.com/go/recommender/apiv1beta1;recommender, --grpc-service-config google/cloud/recommender/v1beta1/recommender_grpc_service_config.json, --gapic-service-config google/cloud/recommender/v1beta1/recommender_v1beta1.yaml, --release-level beta