updated docs;

Author: naman-msft

scenarios/DeployTrinoOnAKS/deploy-trino-on-aks.md

@@ -76,6 +76,7 @@ az aks get-credentials --resource-group $RESOURCE_GROUP_NAME --name $AKS_CLUSTER
 Namespaces help organize your Kubernetes resources.
 
 ```bash
+export NAMESPACE="trino"
 kubectl create namespace $NAMESPACE
 ```