Added link to AWS Pod identity docs

[whatnick]

Follow on to #6368 to include AWS docs.

Proposed Changes

• Add link to AWS Docs for pod identity

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[dprotaso]

/lgtm
/approve
/cherry-pick release-1.19

[knative-prow-robot]

@dprotaso: once the present PR merges, I will cherry-pick it on top of release-1.19 in a new PR and assign it to you.

In response to this:

/lgtm
/approve
/cherry-pick release-1.19

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[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, whatnick

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• OWNERS [dprotaso]

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[knative-prow-robot]

@dprotaso: new pull request created: #6414

In response to this:

/lgtm
/approve
/cherry-pick release-1.19

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.