xml: Fix comment so that example code compiles

R=rsc
CC=golang-dev
https://golang.org/cl/181138
diff --git a/src/pkg/xml/read.go b/src/pkg/xml/read.go
index c1defe5..4865c06 100644
--- a/src/pkg/xml/read.go
+++ b/src/pkg/xml/read.go
@@ -39,7 +39,7 @@
 //		Email []Email;
 //	}
 //
-//	var result = Result{ "name", "phone", nil }
+//	result := Result{ Name: "name", Phone: "phone", Email: nil }
 //
 // unmarshalling the XML input
 //