message: docs: Mention connect_timeout for gRPC services also
  It's mandatory for these also; `envoy` refuses to start if I don't provide it.
diff: @@ -46,6 +46,7 @@ A sample filter configuration for a gRPC authorization server:
  http2_protocol_options: {}
  hosts:
  - socket_address: { address: 127.0.0.1, port_value: 10003 }
  + connect_timeout: 0.25s
  A sample filter configuration for a raw HTTP authorization server:
  