bytes: add example for (*Buffer).Bytes

Change-Id: I49ac604530fff7928fa15de07563418b104da5e4
Reviewed-on: https://go-review.googlesource.com/c/go/+/268260
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Trust: Giovanni Bajo <rasky@develer.com>
diff --git a/src/bytes/example_test.go b/src/bytes/example_test.go
index 5ba7077..ae93202 100644
--- a/src/bytes/example_test.go
+++ b/src/bytes/example_test.go
@@ -30,6 +30,13 @@
 	// Output: Gophers rule!
 }
 
+func ExampleBuffer_Bytes() {
+	buf := bytes.Buffer{}
+	buf.Write([]byte{'h', 'e', 'l', 'l', 'o', ' ', 'w', 'o', 'r', 'l', 'd'})
+	os.Stdout.Write(buf.Bytes())
+	// Output: hello world
+}
+
 func ExampleBuffer_Grow() {
 	var b bytes.Buffer
 	b.Grow(64)