minor edits to developer-concepts/ReadMe
minor edits to developer-concepts/ReadMe

arun-gupta/kubernetes-aws-workshop,dalbhanj/kubernetes-aws-workshop,arun-gupta/kubernetes-aws-workshop,wombat/kubernetes-aws-workshop,dalbhanj/kubernetes-aws-workshop,dalbhanj/kubernetes-aws-workshop,arun-gupta/kubernetes-aws-workshop,dalbhanj/kubernetes-aws-workshop,arun-gupta/kubernetes-aws-workshop