doc(eks): fix(eks): update support for AL2023 nodegroups creation

packages/aws-cdk-lib/aws-eks/README.md

@@ -187,7 +187,6 @@ cluster.addNodegroupCapacity('custom-node-group', {
   instanceTypes: [new ec2.InstanceType('m5.large')],
   minSize: 4,
   diskSize: 100,
-  amiType: eks.NodegroupAmiType.AL2_X86_64_GPU,
 });
 ```
 
@@ -207,6 +206,24 @@ cluster.addNodegroupCapacity('custom-node-group', {
 });
 ```
 
+To define the type of the AMI for the node group, you may explicitly define `amiType` according to your requirements, supported amiType could be found [HERE](https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-eks/lib/managed-nodegroup.ts#L562-L565).
+
+```ts
+declare const cluster: eks.Cluster;
+
+// X86_64 based AMI managed node group
+cluster.addNodegroupCapacity('custom-node-group', {
+  instanceTypes: [new ec2.InstanceType('m5.large')], // NOTE: if amiType is x86_64-based image, the instance types here must be x86_64-based.
+  amiType: eks.NodegroupAmiType.AL2023_X86_64_STANDARD,
+});
+
+// ARM_64 based AMI managed node group
+cluster.addNodegroupCapacity('custom-node-group', {
+  instanceTypes: [new ec2.InstanceType('m6g.medium')], // NOTE: if amiType is ARM-based image, the instance types here must be ARM-based.
+  amiType: eks.NodegroupAmiType.AL2023_ARM_64_STANDARD,
+});
+```
+
 To define the maximum number of instances which can be simultaneously replaced in a node group during a version update you can set `maxUnavailable` or `maxUnavailablePercentage` options.
 
 > For more details visit [Updating a managed node group](https://docs.aws.amazon.com/eks/latest/userguide/update-managed-node-group.html)
@@ -895,15 +912,30 @@ Amazon Linux 2 AMI for ARM64 will be automatically selected.
 
 ```ts
 declare const cluster: eks.Cluster;
-// add a managed ARM64 nodegroup
+
+// add a managed ARM64 nodegroup with no amiType specified (default: AL2_ARM_64)
 cluster.addNodegroupCapacity('extra-ng-arm', {
   instanceTypes: [new ec2.InstanceType('m6g.medium')],
   minSize: 2,
 });
 
-// add a self-managed ARM64 nodegroup
+// add a managed ARM64 nodegroup with amiType explicitly set as AL2023_ARM_64_STANDARD
+cluster.addNodegroupCapacity('extra-ng-arm-al2023', {
+  instanceTypes: [new ec2.InstanceType('m6g.medium')],
+  amiType: eks.NodegroupAmiType.AL2023_ARM_64_STANDARD,
+  minSize: 2,
+});
+
+// add a self-managed ARM64 nodegroup with no amiType specified (default: AL2_ARM_64)
+cluster.addAutoScalingGroupCapacity('self-ng-arm', {
+  instanceType: new ec2.InstanceType('m6g.medium'),
+  minCapacity: 2,
+})
+
+// add a self-managed ARM64 nodegroup with amiType explicitly set as AL2023_ARM_64_STANDARD
 cluster.addAutoScalingGroupCapacity('self-ng-arm', {
   instanceType: new ec2.InstanceType('m6g.medium'),
+  amiType: eks.NodegroupAmiType.AL2023_ARM_64_STANDARD,
   minCapacity: 2,
 })
 ```