microgen: add missing comma in datastransfer row
microgen: add missing comma in datastransfer row

Change-Id: Iaf13f2de8bbf46a4f658f6f33b8090520324117c
Reviewed-on: https://code-review.googlesource.com/c/gocloud/+/49050
Reviewed-by: Cody Oss <f11fa1e55ff5638510f5bf86ea76672a630250f9@google.com>

googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go,googleapis/google-cloud-go