Add missing install flags

[paigecalvert]

https://deploy-preview-2798--replicated-docs.netlify.app/reference/embedded-cluster-install

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[paigecalvert]

@ajp-io thanks! I made the update to the private-ca example to include the proxy flags.

[paigecalvert]

@ajp-io also saw that Salah confirmed the wording for the network interface flag, so going to merge this