Support GRPC routes

Co-authored-by: Romain <rtribotte@users.noreply.github.com>

docs/content/migration/v3.md

@@ -75,3 +75,31 @@ To configure `kubernetesgateway`, please check out the [KubernetesGateway Provid
 
 The Kubernetes Ingress provider option `disableIngressClassLookup` has been deprecated in v3.1.1, and will be removed in the next major version.
 Please use the `disableClusterScopeResources` option instead to avoid cluster scope resources discovery (IngressClass, Nodes).
+
+## v3.1 to v3.2
+
+### Kubernetes Gateway Provider RBACs
+
+Starting with v3.2, the Kubernetes Gateway Provider now supports [GRPCRoute](https://gateway-api.sigs.k8s.io/api-types/grpcroute/).
+
+Therefore, in the corresponding RBACs (see [KubernetesGateway](../reference/dynamic-configuration/kubernetes-gateway.md#rbac) provider RBACs),
+the `grcroutes` and `grpcroutes/status` rights have to be added.
+
+```yaml
+  ...
+  - apiGroups:
+      - gateway.networking.k8s.io
+    resources:
+      - grpcroutes
+    verbs:
+      - get
+      - list
+      - watch
+  - apiGroups:
+      - gateway.networking.k8s.io
+    resources:
+      - grpcroutes/status
+    verbs:
+      - update
+  ...
+```