Rename label-related variables for homeservers

We'd be adding integration with an internal Traefik entrypoint
(`matrix_playbook_internal_matrix_client_api_traefik_entrypoint`),
so renaming helps disambiguate things.

There's no need for deperecation tasks, because the old names
have only been part of this `bye-bye-nginx-proxy` branch and not used by
anyone publicly.

docs/configuring-playbook-synapse-admin.md

@@ -18,7 +18,7 @@ matrix_synapse_admin_enabled: true
 **Note**: Synapse Admin requires Synapse's [Admin APIs](https://matrix-org.github.io/synapse/latest/usage/administration/admin_api/index.html) to function. Access to them is restricted with a valid access token, so exposing them publicly should not be a real security concern. Still, for additional security, we normally leave them unexposed, following [official Synapse reverse-proxying recommendations](https://github.com/matrix-org/synapse/blob/master/docs/reverse_proxy.md#synapse-administration-endpoints). Because Synapse Admin needs these APIs to function, when installing Synapse Admin, the playbook **automatically** exposes the Synapse Admin API publicly for you. Depending on the homeserver implementation you're using (Synapse, Dendrite), this is equivalent to:
 
 - for Synapse (our default homeserver implementation): `matrix_synapse_container_labels_public_client_synapse_admin_api_enabled: true`
-- for [Dendrite](./configuring-playbook-dendrite.md): `matrix_dendrite_container_labels_client_synapse_admin_api_enabled: true`
+- for [Dendrite](./configuring-playbook-dendrite.md): `matrix_dendrite_container_labels_public_client_synapse_admin_api_enabled: true`
 
 
 ## Installing