Very minor code edit to migrate-to-azure-container-apps-blue-green.md.

Author: JoshTheTechWriter

articles/spring-apps/migration/migrate-to-azure-container-apps-blue-green.md

@@ -84,7 +84,7 @@ export GREEN_DOMAIN=$(az containerapp revision show \
     --resource-group <resource-group> \
     --name <app-name> \
     --revision <green-revision-name> \
-    --query "properties.fqdn"
+    --query "properties.fqdn" \
     --output tsv)
 
 curl -s https://$GREEN_DOMAIN