Update horizontal-pod-autoscale-walkthrough.md

As per the error described in https://github.com/LevelUpEducation/kubernetes-demo/issues/31, guidance was to add the generator explicitly:

`kubectl run --generator=run-pod/v1 -i --tty load-generator --image=busybox /bin/sh`

But I prefer the example from the run docs https://jamesdefabia.github.io/docs/user-guide/kubectl/kubectl_run/:

`kubectl run -i --tty busybox --image=busybox --restart=Never`
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Matt Smith 2020-09-14 19:59:45 +10:00 committed by GitHub
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@ -114,7 +114,7 @@ Now, we will see how the autoscaler reacts to increased load.
We will start a container, and send an infinite loop of queries to the php-apache service (please run it in a different terminal):
```shell
kubectl run -it --rm load-generator --image=busybox /bin/sh
kubectl run -i --tty busybox --image=busybox --restart=Never
Hit enter for command prompt