fix typo

Author: obipawan

docs/quickstart/node.md

@@ -59,7 +59,7 @@ buffers; you can find out lots more about how to define a service in a `.proto`
 file in [gRPC Basics: Node][]. For now all you need
 to know is that both the server and the client "stub" have a `SayHello` RPC
 method that takes a `HelloRequest` parameter from the client and returns a
-`HelloResponse` from the server, and that this method is defined like this:
+`HelloReply` from the server, and that this method is defined like this:
 
 
 ```proto