Fix typo: applicaiton -> application

Author: changeworld

articles/application-gateway/ingress-controller-autoscale-pods.md

@@ -123,7 +123,7 @@ spec:
 Test your setup by using a load test tool like ApacheBench:
 
 ```bash
-ab -n10000 http://<applicaiton-gateway-ip-address>/
+ab -n10000 http://<application-gateway-ip-address>/
 ```
 
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