Update irsa.md (#2217)

Point to newer docs for using AWS IAM Roles Anywhere.

Issue #, if available:
N/A 
Description of changes:
For non EKS clusters Digizens have been pointed to older documentation that needed to be updated. 

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

docs/content/docs/user-docs/irsa.md

@@ -22,7 +22,7 @@ AWS SDK or the AWS CLI to make API requests to authorized AWS services.
 
 Quicklinks:
 * [Setup IRSA for EKS cluster](./#step-1-create-an-oidc-identity-provider-for-your-cluster)
-* [Setup IRSA for non-EKS cluster](https://github.com/aws/amazon-eks-pod-identity-webhook/blob/master/SELF_HOSTED_SETUP.md)
+* [Setup IRSA for non-EKS cluster](https://docs.aws.amazon.com/rolesanywhere/latest/userguide/introduction.html)
 
 Follow the quicklink OR continue reading for more details about IRSA.
 {{% /hint %}}