fix the number of replicas in an example

Author: DanteMustCode

content/en/docs/concepts/workloads/controllers/deployment.md

@@ -399,7 +399,9 @@ rolled back.
 * Press Ctrl-C to stop the above rollout status watch. For more information on stuck rollouts,
 [read more here](#deployment-status).
 
-* You see that the number of old replicas (`nginx-deployment-1564180365` and `nginx-deployment-2035384211`) is 2, and new replicas (nginx-deployment-3066724191) is 1.
+* You see that the number of old replicas (adding the replica count from
+  `nginx-deployment-1564180365` and `nginx-deployment-2035384211`) is 3, and the number of
+  new replicas (from `nginx-deployment-3066724191`) is 1.
 
   ```shell
   kubectl get rs