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Remove localhost recommendation (#8864) 

We are going to break `localhost` listeners: https://docs.google.com/document/d/1j-5_XpeMTnT9mV_8dbSOeU7rfH-5YNtN_JJFZ2mmQ_w/edit#. It was bad advice to begin with, written by myself I believe
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content/en/docs/ops/deployment/requirements/index.md
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@ -139,9 +139,8 @@ Because TLS communication is not server first, TLS encrypted server first traffi
## Application Bind Address
When Istio captures inbound traffic, it will redirect it to the `localhost` address. As a result, applications should bind to either
`localhost` (`127.0.0.1` for IPv4 or `::1` for IPv6) or wildcard (`0.0.0.0` for IPv4 or `::` for IPv6). Applications listening on their
pod IP will need to be modified.
When Istio captures inbound traffic, it will redirect it to the `localhost` address. As a result, applications should bind to
wildcard (`0.0.0.0` for IPv4 or `::` for IPv6). Applications listening on their pod IP will need to be modified.
## Outbound traffic