add summarized diff

Author: hbagdi

site-src/geps/gep-718.md

@@ -124,9 +124,64 @@ type RouteForwardTo struct {
 	// +kubebuilder:validation:Maximum=1000000
 	Weight *int32 `json:"weight,omitempty"`
 }
-
 ```
 
+A summarized diff for the changes being proposed:
+
+```patch
+diff --git a/apis/v1alpha2/shared_types.go b/apis/v1alpha2/shared_types.go
+index 1215300..228f861 100644
+--- a/apis/v1alpha2/shared_types.go
++++ b/apis/v1alpha2/shared_types.go
+@@ -96,10 +96,7 @@ type GatewayReference struct {
+ 
+ // RouteForwardTo defines how a Route should forward a request.
+ type RouteForwardTo struct {
+-	// ServiceName refers to the name of the Service to forward matched requests
+-	// to. When specified, this takes the place of BackendRef. If both
+-	// BackendRef and ServiceName are specified, ServiceName will be given
+-	// precedence.
++	// BackendRef is a reference to a backend to forward matched requests to.
+ 	//
+ 	// If the referent cannot be found, the rule is not included in the route.
+ 	// The controller should raise the "ResolvedRefs" condition on the Gateway
+@@ -115,30 +112,16 @@ type RouteForwardTo struct {
+ 	// in the BackendPolicy resource. For custom backends, it is encouraged to
+ 	// add a semantically-equivalent field in the Custom Resource Definition.
+ 	//
+-	// Support: Core
+-	//
+-	// +optional
+-	// +kubebuilder:validation:MaxLength=253
+-	ServiceName *string `json:"serviceName,omitempty"`
+-
+-	// BackendRef is a reference to a backend to forward matched requests to. If
+-	// both BackendRef and ServiceName are specified, ServiceName will be given
+-	// precedence.
+-	//
+-	// If the referent cannot be found, the rule is not included in the route.
+-	// The controller should raise the "ResolvedRefs" condition on the Gateway
+-	// with the "DegradedRoutes" reason. The gateway status for this route should
+-	// be updated with a condition that describes the error more specifically.
+-	//
+-	// Support: Custom
++	// Support: Core (Kubernetes Service)
++	// Support: Custom (any other resource)
+ 	//
+ 	// +optional
++	// +kubebuilder:default={kind: "service"}
+ 	BackendRef *LocalObjectReference `json:"backendRef,omitempty"`
+ 
+ 	// Port specifies the destination port number to use for the
+-	// backend referenced by the ServiceName or BackendRef field.
+-	// If unspecified, the destination port in the request is used
+-	// when forwarding to a backendRef or serviceName.
++	// backend referenced by BackendRef field. Port is required when the backend
++	// is a Kubernetes Service.
+ 	//
+ 	// Support: Core
+ 	//
+```
 For Kubernetes Services, the API will look like the following:
 
 ```yaml