Fix snippets by specifying which TopicName we need (#3652)
Fix snippets by specifying which TopicName we need (#3652)


jskeet/google-cloud-dotnet,googleapis/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,jskeet/google-cloud-dotnet,googleapis/google-cloud-dotnet,jskeet/gcloud-dotnet,googleapis/google-cloud-dotnet