fix egrep script in walkthrough doc to correctly filter aws-load-balancer-controller

[ysam12345]

Description

Found the egrep script is missing apostrophe so it will fail to get the log of pod "aws-load-balancer-controller".

# original
kubectl logs -n kube-system $(kubectl get po -n kube-system | egrep -o aws-load-balancer-controller[a-zA-Z0-9-]+)

# fixed
kubectl logs -n kube-system $(kubectl get po -n kube-system | egrep -o 'aws-load-balancer-controller[a-zA-Z0-9-]+')

Test

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[ysam12345]

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This pull-request has been approved by: kishorj, ysam12345
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