Fix LogMultiplayer example in docs

Fixes issues:
 - `server_disconnected` signal not being emitted
 - `multiplayer.get_remote_sender_id()` returning `0`

doc/classes/MultiplayerAPIExtension.xml

@@ -18,10 +18,12 @@
 		    # Just passthrough base signals (copied to var to avoid cyclic reference)
 		    var cts = connected_to_server
 		    var cf = connection_failed
+		    var sd = server_disconnected
 		    var pc = peer_connected
 		    var pd = peer_disconnected
 		    base_multiplayer.connected_to_server.connect(func(): cts.emit())
 		    base_multiplayer.connection_failed.connect(func(): cf.emit())
+		    base_multiplayer.server_disconnected.connect(func(): sd.emit())
 		    base_multiplayer.peer_connected.connect(func(id): pc.emit(id))
 		    base_multiplayer.peer_disconnected.connect(func(id): pd.emit(id))
 
@@ -59,6 +61,9 @@
 		func _get_unique_id() -> int:
 		    return base_multiplayer.get_unique_id()
 
+		func _get_remote_sender_id() -> int:
+		    return base_multiplayer.get_remote_sender_id()
+
 		func _get_peer_ids() -> PackedInt32Array:
 		    return base_multiplayer.get_peers()
 		[/gdscript]