doc: example 'external-dns' v1.1.8 does not work on IRSA

[zxkane]

Since v1.1.8 the example of 'external-doc' uses bitnami/external-dns that uses user 1001 to run the external-dns process who does not has permission to read web identity token. It's also a known issue of aws/amazon-eks-pod-identity-webhook#8 pending on upstream kubernetes.

There is a workaround
kubernetes-sigs/external-dns#1185 (comment) to grant the permission.

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@fejta-bot: Closing this issue.

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