docs: fix users example

Author: dkoshkin

docs/content/customization/generic/users.md

@@ -32,9 +32,9 @@ spec:
       - name: clusterConfig
         value:
           users:
-            - name: admin
-                sshAuthorizedKeys:
-                  - "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAua0lo8BiGWgvIiDCKnQDKL5uERHfnehm0ns5CEJpJw optionalcomment"
+            - name: username
+              sshAuthorizedKeys:
+                - "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIAua0lo8BiGWgvIiDCKnQDKL5uERHfnehm0ns5CEJpJw optionalcomment"
               sudo: "ALL=(ALL) NOPASSWD:ALL"
 ```