Update API Group under backendRefs (#21961)

* Update routes.mdx

Currently backendRefs refers to api-gateway.consul.hashicorp.com as the API Group that should be used when kind is set to Mesh Service. Based on mesh service template, it should just be consul.hashicorp.com.

* Update backendRefs in route to peered doc

website/content/docs/connect/gateways/api-gateway/configuration/routes.mdx

@@ -101,7 +101,7 @@ This field specifies backend services that the `Route` references. The following
 
 | Parameter | Description | Type | Required |
 | ---       | ---         | ---  | ---      |
-| `group` | Specifies the Kubernetes API Group of the referenced backend. You can specify the following values: <ul><li>`""`: Specifies the core Kubernetes API group. This value must be used when `kind` is set to `Service`. This is the default value if unspecified.</li><li>`api-gateway.consul.hashicorp.com`: This value must be used when `kind` is set to `MeshService`.</li></ul> | String | Optional |
+| `group` | Specifies the Kubernetes API Group of the referenced backend. You can specify the following values: <ul><li>`""`: Specifies the core Kubernetes API group. This value must be used when `kind` is set to `Service`. This is the default value if unspecified.</li><li>`consul.hashicorp.com`: This value must be used when `kind` is set to `MeshService`.</li></ul> | String | Optional |
 | `kind` |  Specifies the Kubernetes Kind of the referenced backend. You can specify the following values: <ul><li>`Service` (default): Indicates that the `backendRef` references a Service in the Kubernetes cluster. </li><li>`MeshService`: Indicates that the `backendRef` references a service in the Consul mesh. Refer to the `MeshService` [documentation](/consul/docs/connect/gateways/api-gateway/configuration/meshservice) for additional information.</li></ul> | String | Optional |
 | `name` | Specifies the name of the Kubernetes Service or Consul mesh service resource. | String | Required |
 | `namespace` | Specifies the Kubernetes namespace containing the Kubernetes Service or Consul mesh service resource. You must specify a value if the Service or Consul mesh service is defined in a different namespace from the `Route`. Defaults to the namespace of the `Route`. <br/>To create a route for a `backendRef` in a different namespace, you must also create a [ReferenceGrant](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.ReferenceGrant). Refer to the [example route](#example-cross-namespace-backendref) configured to reference across namespaces. | String | Optional |

website/content/docs/connect/gateways/api-gateway/define-routes/route-to-peered-services.mdx

@@ -67,7 +67,7 @@ spec:
   ...
   rules:
     - backendRefs:
-        - group: api-gateway.consul.hashicorp.com
+        - group: consul.hashicorp.com
           kind: MeshService
           name: example-mesh-service
           port: 3000