update MNG pod drain timeout

Author: vikash-s1

latest/ug/nodes/delete-managed-node-group.adoc

@@ -12,7 +12,7 @@ This topic describes how you can delete an Amazon EKS managed node group.
 
 This topic describes how you can delete an Amazon EKS managed node group. When you delete a managed node group, Amazon EKS first sets the minimum, maximum, and desired size of your Auto Scaling group to zero. This then causes your node group to scale down.
 
-Before each instance is terminated, Amazon EKS sends a signal to drain the Pods from that node. If the Pods haven't drained after a few minutes, Amazon EKS lets Auto Scaling continue the termination of the instance. After every instance is terminated, the Auto Scaling group is deleted.
+Before each instance is terminated, Amazon EKS sends a signal to drain that node. During the drain process, Kubernetes does the following for each pod on the node: runs any configured `preStop` lifecycle hooks, sends `SIGTERM` signals to the containers, then waits for the `terminationGracePeriodSeconds` for graceful shutdown. If the node hasn't been drained after 5 minutes, Amazon EKS lets Auto Scaling continue the forced termination of the instance. After all instances have been terminated, the Auto Scaling group is deleted.
 
 [IMPORTANT]
 ====