Document wildcard for network interfaces (#28839)

With this commit we mention how Elasticsearch behaves when
either `0` or `0.0.0.0` is used for `network.host`.

docs/reference/modules/network.asciidoc

@@ -24,7 +24,9 @@ this host to other nodes in the cluster. Accepts an IP address, hostname, a
 <<network-interface-values,special value>>, or an array of any combination of
 these. Note that any values containing a `:` (e.g., an IPv6 address or
 containing one of the <<network-interface-values,special values>>) must be
-quoted because `:` is a special character in YAML.
+quoted because `:` is a special character in YAML. `0.0.0.0` is an acceptable
+IP address and will bind to all network interfaces. The value `0` has the
+same effect as the value `0.0.0.0`.
 +
 Defaults to `_local_`.