Document Eventing istio integration

[pierDipi]

trafficstars

Fixes https://github.com/knative-extensions/eventing-istio/issues/21

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[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pierDipi

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[knative-prow-robot]

PR needs rebase.

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[pierDipi]

/hold I want to merge https://github.com/knative/docs/pull/5967 first

[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[pierDipi]

/unhold