Update auto-mode.adoc - uto Mode will be enabled by default in an upcoming release of eksctl

Author: sapphirew

docs/clusters/auto-mode.adoc

@@ -1,5 +1,14 @@
 [.topic]
 [#auto-mode]
+> **⚠️ UPCOMING BEHAVIOR CHANGE**
+> 
+> Auto Mode will be enabled by default in an upcoming release of eksctl. 
+> This means managed node groups will no longer be created by default when creating clusters.
+> 
+> **If you want to maintain the current behavior** (Auto Mode disabled with managed node groups), 
+> you must explicitly set `autoModeConfig.enabled: false` in your cluster configuration.
+> 
+> This change affects clusters created without an explicit `autoModeConfig` section.
 = EKS Auto Mode
 
 eksctl supports link:eks/latest/userguide/automode.html["EKS Auto Mode",type="documentation"], a feature that extends AWS management of Kubernetes clusters beyond the cluster itself,