Resolve #5557 error instantiating route53 challenge solver

[vettom]

Problem : cert-manager/cert-manager#5557
Version validated on : v1.14.4
Fix: Incorrect value in Cluster Issuer section and missing IAM permission.

When using Route53 authentication, IAM RSA account is created and Cert-manager configured with respective ServiceAccount. Once this is done, there is no need to specify role: when creating ClusterIssuer as mentioned in the documentation. Adding Role will result in Access error.

"route53:GetChange" policy is required for Certmanager. Updated policy document with necessary permissions.

[cert-manager-prow]

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[cert-manager-prow]

Thanks for your pull request. Before we can look at it, you'll need to add a 'DCO signoff' to your commits.

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The list of commits missing DCO signoff:

• 2cdf44d Update documentation to fix error
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