Remove experimental callout on GRPCRoute guide.

GRPCRoute is GA and has been included in the standard channel since v1.1.0.

Author: blake

site-src/guides/grpc-routing.md

@@ -1,11 +1,5 @@
 # gRPC routing
 
-!!! info "Experimental Channel"
-
-    The `GRPCRoute` resource described below is currently only included in the
-    "Experimental" channel of Gateway API. For more information on release
-    channels, refer to our [versioning guide](/concepts/versioning).
-
 The [GRPCRoute resource](/api-types/grpcroute) allows you to match on gRPC traffic and
 direct it to Kubernetes backends. This guide shows how the GRPCRoute matches
 traffic on host, header, and service, and method fields and forwards it to different

site-src/guides/index.md

@@ -52,7 +52,7 @@ kubectl apply -f https://github.com/kubernetes-sigs/gateway-api/releases/downloa
 
 The experimental release channel includes everything in the standard release
 channel plus some experimental resources and fields. This includes
-TCPRoute, TLSRoute, UDPRoute and GRPCRoute.
+TCPRoute, TLSRoute, and UDPRoute.
 
 Note that future releases of the API could include breaking changes to
 experimental resources and fields. For example, any experimental resource or