nixos/dokuwiki: Minor code cleanup

nixos/modules/services/web-apps/dokuwiki.nix

@@ -249,16 +249,15 @@ in
 {
   # interface
   options = {
-    services.dokuwiki = mkOption {
-      type = types.submodule {
+    services.dokuwiki = {
 
-        options.sites = mkOption {
+      sites = mkOption {
         type = types.attrsOf (types.submodule siteOpts);
         default = {};
         description = "Specification of one or more DokuWiki sites to serve";
       };
 
-        options.webserver = mkOption {
+      webserver = mkOption {
         type = types.enum [ "nginx" "caddy" ];
         default = "nginx";
         description = ''
@@ -271,12 +270,9 @@ in
           See <xref linkend="opt-services.httpd.virtualHosts"/> for further information.
         '';
       };
-      };
-      default = {};
-      description = "DokuWiki configuration";
-    };
 
     };
+  };
 
   # implementation
   config = mkIf (eachSite != {}) (mkMerge [{