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Hi folks, I met an issue on creating aws serviceRole with pulumi, some code example needs to be updated.

In <https://www.pulumi.com/docs/guides/crosswalk/aws/eks/#configuring-your-eks-clusters-worker-nodes-and-node-groups|pulumi's doc>, rolePolicy string is
```{
    "Version": "2012-10-17",
    "Statement": [{
        "Sid": "AllowAssumeRole",
        "Effect": "Allow",
        "Principal": "<http://ec2.amazonaws.com|ec2.amazonaws.com>",
		"Action": "sts:AssumeRole"
    }]
}```
Which is different from <https://docs.aws.amazon.com/eks/latest/userguide/create-node-role.html|AWS' doc>
```{
  "Version": "2012-10-17",
  "Statement": [
    {
      "Effect": "Allow",
      "Principal": {
        "Service": "<http://ec2.amazonaws.com|ec2.amazonaws.com>"
      },
      "Action": "sts:AssumeRole"
    }
  ]
}```
Different schema on `Principal`  field. And that will cause error like: `Error creating IAM Role xxx-role-53da5df: MalformedPolicyDocument: Syntax error at position (6,41)` .