Fix review comments

Author: LiangquanLi930

api/v1beta2/awsmachinetemplate_types.go

@@ -47,10 +47,12 @@ const (
 type NodeInfo struct {
 	// Architecture is the CPU architecture of the node.
 	// Its underlying type is a string and its value can be any of amd64, arm64.
+	// +kubebuilder:validation:Enum=amd64;arm64
 	// +optional
 	Architecture Architecture `json:"architecture,omitempty"`
 	// OperatingSystem is a string representing the operating system of the node.
 	// This may be a string like 'linux' or 'windows'.
+	// +kubebuilder:validation:Enum=linux;windows
 	// +optional
 	OperatingSystem string `json:"operatingSystem,omitempty"`
 }

config/crd/bases/infrastructure.cluster.x-k8s.io_awsmachinetemplates.yaml

@@ -1163,17 +1163,24 @@ spec:
                   https://github.com/kubernetes-sigs/cluster-api/blob/main/docs/proposals/20210310-opt-in-autoscaling-from-zero.md
                 properties:
                   architecture:
+                    allOf:
+                    - enum:
+                      - amd64
+                      - arm64
+                    - enum:
+                      - amd64
+                      - arm64
                     description: |-
                       Architecture is the CPU architecture of the node.
                       Its underlying type is a string and its value can be any of amd64, arm64.
-                    enum:
-                    - amd64
-                    - arm64
                     type: string
                   operatingSystem:
                     description: |-
                       OperatingSystem is a string representing the operating system of the node.
                       This may be a string like 'linux' or 'windows'.
+                    enum:
+                    - linux
+                    - windows
                     type: string
                 type: object
             type: object