Doc: fix type of stream object

scene/audio/stream_player.cpp

@@ -342,8 +342,8 @@ int StreamPlayer::get_buffering_msec() const{
 
 void StreamPlayer::_bind_methods() {
 
-	ObjectTypeDB::bind_method(_MD("set_stream","stream:Stream"),&StreamPlayer::set_stream);
-	ObjectTypeDB::bind_method(_MD("get_stream:Stream"),&StreamPlayer::get_stream);
+	ObjectTypeDB::bind_method(_MD("set_stream","stream:AudioStream"),&StreamPlayer::set_stream);
+	ObjectTypeDB::bind_method(_MD("get_stream:AudioStream"),&StreamPlayer::get_stream);
 
 	ObjectTypeDB::bind_method(_MD("play","offset"),&StreamPlayer::play,DEFVAL(0));
 	ObjectTypeDB::bind_method(_MD("stop"),&StreamPlayer::stop);