TLSRoute: Set MaxItems=1 for rules[] in v1alpha3 (#3971)

* TLSRoute: Set Rules MaxItems to 1

* TLSRoute: Add omitempty to Rules

* TLSRoute: Rules godoc

Author: rostislavbobo

apis/v1alpha3/tlsroute_types.go

@@ -92,13 +92,13 @@ type TLSRouteSpec struct {
 	// +required
 	Hostnames []Hostname `json:"hostnames,omitempty"`
 
-	// Rules are a list of TLS matchers and actions.
+	// Rules are a list of actions.
 	//
 	// +required
 	// +kubebuilder:validation:MinItems=1
-	// +kubebuilder:validation:MaxItems=16
+	// +kubebuilder:validation:MaxItems=1
 	// <gateway:experimental:validation:XValidation:message="Rule name must be unique within the route",rule="self.all(l1, !has(l1.name) || self.exists_one(l2, has(l2.name) && l1.name == l2.name))">
-	Rules []v1alpha2.TLSRouteRule `json:"rules"`
+	Rules []v1alpha2.TLSRouteRule `json:"rules,omitempty"`
 }
 
 // +kubebuilder:object:root=true