DOCS Correct audit emit_node_id default value as false (#56995)

Since version 7, the `xpack.security.audit.logfile.emit_node_id` setting defaults
to `false`, yet the docs say otherwise. This commit fixes that.

docs/reference/settings/audit-settings.asciidoc

@@ -45,8 +45,7 @@ audited in plain text when including the request body in audit events.
 
 `xpack.security.audit.logfile.emit_node_name`::
 Specifies whether to include the <<node.name,node name>> as a field in
-each audit event.
-The default value is `true`.
+each audit event. The default value is `false`.
 
 `xpack.security.audit.logfile.emit_node_host_address`::
 Specifies whether to include the node's IP address as a field in each audit event.