Merge pull request #4130 from mattjmcnaughton/mattjmcnaughton/fix-inaccurate-comment-in-tiller

Fix inaccurate comment in `tiller`

cmd/tiller/tiller.go

@@ -85,7 +85,7 @@ var (
 
 	// rootServer is the root gRPC server.
 	//
-	// Each gRPC service registers itself to this server during init().
+	// Each gRPC service registers itself to this server during start().
 	rootServer *grpc.Server
 
 	// env is the default environment.