Update references to Connect RPC (#30875)

* Update references to Connect RPC

This now lives at connectrpc.com.

Signed-off-by: Michael Rebello <me@michaelrebello.com>

Mirrored from https://github.com/envoyproxy/envoy @ afdc6606979bfd6cd486465d771ff2bb78468bf5

envoy/extensions/filters/http/connect_grpc_bridge/v3/config.proto

@@ -13,10 +13,10 @@ option go_package = "github.com/envoyproxy/go-control-plane/envoy/extensions/fil
 option (udpa.annotations.file_status).package_version_status = ACTIVE;
 option (xds.annotations.v3.file_status).work_in_progress = true;
 
-// [#protodoc-title: Buf Connect to gRPC] Buf Connect to gRPC bridge
+// [#protodoc-title: Connect RPC to gRPC] Connect RPC to gRPC bridge
 // :ref:`configuration overview <config_http_filters_connect_grpc_bridge>`.
 // [#extension: envoy.filters.http.connect_grpc_bridge]
 
-// Buf Connect gRPC bridge filter configuration
+// Connect RPC to gRPC bridge filter configuration
 message FilterConfig {
 }