Merge pull request #5276 from abbradar/nginx-types

nixos/nginx: add more types

nixos/modules/services/web-servers/nginx/default.nix

···
     services.nginx = {
       enable = mkOption {
         default = false;
+        type = types.bool;
         description = "
           Enable the nginx Web Server.
         ";
···
       };
 
       user = mkOption {
+        type = types.str;
         default = "nginx";
         description = "User account under which nginx runs.";
       };
 
       group = mkOption {
+        type = types.str;
         default = "nginx";
         description = "Group account under which nginx runs.";
       };