pkg/bytes: add the usual copyright notice to example_test.go
R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5553050
diff --git a/src/pkg/bytes/example_test.go b/src/pkg/bytes/example_test.go
index 02da1ac..0234a01 100644
--- a/src/pkg/bytes/example_test.go
+++ b/src/pkg/bytes/example_test.go
@@ -1,3 +1,7 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
package bytes_test
import (
