Lambda invocation documentation incorrect

#### Overview of the Issue

https://github.com/hashicorp/consul/blob/main/website/content/docs/lambda/registration/index.mdx

includes the text

On [AWS EKS](https://aws.amazon.com/eks/), associate an IAM role with the proxy's ServiceAccount. Refer to the [AWS IAM roles for service accounts](https://docs.aws.amazon.com/eks/latest/userguide/iam-roles-for-service-accounts.html) documentation for instructions.

However this is not currently supported in envoy - only EC2 metadata, ECS task data or environment variables are supported. The docs on the main invocation page don't mention EKS and so they are correct. On EKS the only way to do this atm is to add the role to node metadata.