Update installing-istio.md

[theofpa]

remove deprecated command

istio/istio.io#16120

[knative-prow]

Welcome @theofpa! It looks like this is your first PR to knative/docs 🎉

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[dprotaso]

/approve
/lgtm
/cheryy-pick release-1.17

[dprotaso]

/cherry-pick release-1.17

[dprotaso]

/cherry-pick release-1.16

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[knative-prow-robot]

@dprotaso: once the present PR merges, I will cherry-pick it on top of release-1.17 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.17

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.

[knative-prow-robot]

@dprotaso: once the present PR merges, I will cherry-pick it on top of release-1.16 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.16

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.

[knative-prow-robot]

@dprotaso: new pull request created: #6219

In response to this:

/cherry-pick release-1.16

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.

[knative-prow-robot]

@dprotaso: new pull request created: #6220

In response to this:

/cherry-pick release-1.17

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.