Update prerequisites.md to add IAM section header
- [AWS CLI](https://docs.aws.amazon.com/cli/latest/userguide/installing.html)
- [jq](https://stedolan.github.io/jq/download/)
+## IAM resources
### With `clusterawsadm`
Get the latest [clusterawsadm](https://github.com/kubernetes-sigs/cluster-api-provider-aws/releases)
