remove mention of other docker host in external webserver documentation (binding ports section)

docs/configuring-playbook-own-webserver.md

@@ -33,16 +33,16 @@ No matter which external webserver you decide to go with, you'll need to:
         ```yaml
         matrix_nginx_proxy_enabled: false
         ```
-    - if using an external server on another docker network or host, add the `<service>_http_host_bind_port` or `<service>_http_bind_port` variables for the services that will be exposed by the external server on the other docker network or host. The actual name of the variable is listed in the `roles/<service>/defaults/vars.yml` file for each service. Most variables follow the `<service>_http_host_bind_port` format.
+    - if using an external server on another host, add the `<service>_http_host_bind_port` or `<service>_http_bind_port` variables for the services that will be exposed by the external server on the other host. The actual name of the variable is listed in the `roles/<service>/defaults/vars.yml` file for each service. Most variables follow the `<service>_http_host_bind_port` format.
        
       These variables will make Docker expose the ports to the local network instead of localhost only.
       [Keep in mind that there are some security concerns if you simply proxy everything.](https://github.com/matrix-org/synapse/blob/master/docs/reverse_proxy.md#synapse-administration-endpoints)
 
       Here are the variables required for the default configuration (Synapse and Element)
        ```
-        matrix_synapse_container_client_api_host_bind_port: '8008'
-        matrix_synapse_container_federation_api_plain_host_bind_port: '8048'
-        matrix_client_element_container_http_host_bind_port: "8765"
+        matrix_synapse_container_client_api_host_bind_port: '0.0.0.0:8008'
+        matrix_synapse_container_federation_api_plain_host_bind_port: '0.0.0.0:8048'
+        matrix_client_element_container_http_host_bind_port: "0.0.0.0:8765"
        ```
 
 3) **If you'll manage SSL certificates by yourself**, edit your configuration file (`inventory/host_vars/matrix.<your-domain>/vars.yml`) to disable SSL certificate retrieval: