docs/content: Update Envoy Authorization Tutorial
docs/content: Update Envoy Authorization Tutorial

Updated envoy version and links. Updated service type and minikube commands to tunnel to the service for consistency across minikube versions and drivers

Signed-off-by: Peter Sullivan <1c3acc27db0854e223073241dbcb3e2e2be5b28b@gmail.com>

tsandall/opa,open-policy-agent/opa,tsandall/opa,tsandall/opa,open-policy-agent/opa,tsandall/opa,tsandall/opa,tsandall/opa,open-policy-agent/opa,open-policy-agent/opa,open-policy-agent/opa,open-policy-agent/opa