improve comments

Author: kaijchen

src/brpc/policy/baidu_rpc_protocol.cpp

@@ -248,7 +248,7 @@ void SendRpcResponse(int64_t correlation_id,
     // stream for some reason.
     if(cntl->has_remote_stream()){
         // In certain cases, if the server-side stream is actively closing the stream.
-        // The client-side cannot receive on_closed message due to connectted is not set.
+        // The close frame is not sent to client-side due to connected is not set.
         // We should set connected before send stream data.
         if (stream_ptr) {
             // Now it's ok the mark this server-side stream as connectted as all the