docs/src/modules/examples: fix user example

Author: yunfachi

docs/src/modules/examples.md

@@ -109,8 +109,6 @@ delib.module {
     inherit (myconfig.constants) username;
   in {
     users = {
-      groups.${username} = {};
-
       users.${username} = {
         isNormalUser = true;
         initialPassword = username;

docs/src/ru/modules/examples.md

@@ -5,12 +5,10 @@
 delib.module {
   name = "constants";
 
-  options = {
-    constants = with delib; {
-      username = readOnly (strOption "sjohn");
-      userfullname = readOnly (strOption "John Smith");
-      useremail = readOnly (strOption "johnsmith@example.com");
-    };
+  options.constants = with delib; {
+    username = readOnly (strOption "sjohn");
+    userfullname = readOnly (strOption "John Smith");
+    useremail = readOnly (strOption "johnsmith@example.com");
   };
 }
 ```
@@ -109,8 +107,6 @@ delib.module {
     inherit (myconfig.constants) username;
   in {
     users = {
-      groups.${username} = {};
-
       users.${username} = {
         isNormalUser = true;
         initialPassword = username;