fix example for tcp scale rule

Author: Greedygre

articles/container-apps/scale-app.md

@@ -214,6 +214,7 @@ az containerapp create \
   --image <CONTAINER_IMAGE_LOCATION>
   --min-replicas 0 \
   --max-replicas 5 \
+  --transport tcp \
   --scale-rule-name azure-tcp-rule \
   --scale-rule-type tcp \
   --scale-rule-tcp-concurrency 100