Update the docs to reflect the changes for 1.13 operator

[houshengbo]

Proposed Changes

• This PR updated the docs for the 1.13 operator.

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[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, houshengbo

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[Cali0707]

@houshengbo do we need to backport this to release-1.13?

[houshengbo]

/cherry-pick release-1.13

[knative-prow-robot]

@houshengbo: new pull request created: #5847

In response to [this](https://github.com/knative/docs/pull/5846#issuecomment-1917850449): >/cherry-pick release-1.13 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[houshengbo]

yes, I just created the one for release-1.13.