Merge pull request #758 from orgads/missing-word-in-comment

Add a missing word in cpp documentation

Author: carl-mastrangelo

docs/quickstart/cpp.md

@@ -195,7 +195,7 @@ class GreeterClient {
     HelloReply reply;
     ClientContext context;
 
-    // Here we can the stub's newly available method we just added.
+    // Here we can use the stub's newly available method we just added.
     Status status = stub_->SayHelloAgain(&context, request, &reply);
     if (status.ok()) {
       return reply.message();