Fix container_igm example: instanceGroupManagers -> instanceGroupManager ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=113183709
Fix container_igm example: instanceGroupManagers -> instanceGroupManager
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=113183709

aljim/deploymentmanager-samples,aljim/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,aljim/deploymentmanager-samples,aljim/deploymentmanager-samples,jaivasanth-google/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,GoogleCloudPlatform/deploymentmanager-samples,jaivasanth-google/deploymentmanager-samples