Update scaling.md

fix typo

Author: nullfunc

docs/concepts/scaling.md

@@ -37,7 +37,7 @@ Instead of manually adding more instances when traffic increases, an auto-scalin
 
 ### Example
 
-With Defang a user, with a Pro and higher plan, can enable service level autoscaling by adding a _**x-defang-autoscaling**_ extension to the services which is to be autoscaled.
+With Defang a user, with a Pro and higher plan, can enable service level autoscaling by adding a _**x-defang-autoscaling**_ extension to the service which is to be autoscaled.
 
 ```yaml
 services:
@@ -81,4 +81,4 @@ Auto-scaling systems typically rely on:
 - Ensure services are **stateless** or use **externalized state** (e.g., databases, caches) for smooth scaling. ([12 Factor App](https://12factor.net/processes))
 - Test services under load to identify scaling bottlenecks.
   
-See Tutorial page [Scaling Tutorial](/docs/tutorials/scaling-your-services)
+See Tutorial page [Scaling Tutorial](/docs/tutorials/scaling-your-services)