Add templateinstances to troubleshooting doc (#643)

Author: dymurray

docs/TROUBLESHOOTING.md

@@ -195,7 +195,7 @@ If the issue still persists, [create a new issue](https://github.com/openshift/o
 
     Step 2: Initiate a restore excluding the replicationcontroller and deploymentconfig resources.
     ```
-    velero restore create --from-backup=<BACKUP_NAME> -n openshift-adp --include-namespaces <TARGET_NAMESPACE> --exclude-resources replicationcontroller,deploymentconfig --restore-volumes=true
+    velero restore create --from-backup=<BACKUP_NAME> -n openshift-adp --include-namespaces <TARGET_NAMESPACE> --exclude-resources replicationcontroller,deploymentconfig,templateinstances.template.openshift.io --restore-volumes=true
     ```
 
     Step 3: Initiate a restore including the replicationcontroller and deploymentconfig resources.
@@ -229,4 +229,4 @@ If the issue still persists, [create a new issue](https://github.com/openshift/o
   ```
 
   This is a known Velero [issue](https://github.com/vmware-tanzu/velero/issues/4421) 
-  which appears to be in the process of deciding expected behavior. 
+  which appears to be in the process of deciding expected behavior.