grpc_xds_features.md: Add RBAC (#28352)

doc/grpc_xds_features.md

@@ -65,3 +65,4 @@ Support for [xDS v3 APIs](https://www.envoyproxy.io/docs/envoy/latest/api-v3/api
 [Ring hash](https://www.envoyproxy.io/docs/envoy/latest/intro/arch_overview/upstream/load_balancing/load_balancers#ring-hash) load balancing policy:<br> Only the following [policy specifiers](https://github.com/envoyproxy/envoy/blob/2443032526cf6e50d63d35770df9473dd0460fc0/api/envoy/config/route/v3/route_components.proto#L706) are supported:<ul><li>header</li><li>filter_state with key `io.grpc.channel_id`</li></ul>Only [`XX_HASH`](https://github.com/envoyproxy/envoy/blob/2443032526cf6e50d63d35770df9473dd0460fc0/api/envoy/config/cluster/v3/cluster.proto#L383) function is supported. | [A42](https://github.com/grpc/proposal/blob/master/A42-xds-ring-hash-lb-policy.md) | v1.40.0<br>(C++ and Python) | v1.40.1 | 1.41.0 | |
 [Retry](https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/route/v3/route_components.proto#envoy-v3-api-msg-config-route-v3-retrypolicy):<br>Only the following fields are supported:<ul><li>retry_on for the following conditions: cancelled, deadline-exceeded, internal, resource-exhausted, and unavailable.</li><li>num_retries</li><li>retry_back_off</li></ul> | [A44](https://github.com/grpc/proposal/blob/master/A44-xds-retry.md) | v1.40.0<br>(C++ and Python) | v1.40.1 | 1.41.0 | |
 [Security](https://www.envoyproxy.io/docs/envoy/latest/configuration/security/security):<br>Uses [certificate providers](https://github.com/grpc/proposal/blob/master/A29-xds-tls-security.md#certificate-provider-plugin-framework) instead of SDS | [A29](https://github.com/grpc/proposal/blob/master/A29-xds-tls-security.md) | v1.41.0<br>(C++ and Python) | v1.41.0 | 1.41.0 | |
+[Authorization (RBAC)](https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/http/rbac/v3/rbac.proto):<br><ul><li>`LOG` action has no effect<li>CEL unsupported and rejected</ul> | [A41](https://github.com/grpc/proposal/blob/master/A41-xds-rbac.md) | | v1.42.0 | 1.42.0 | |