bytes: add examples of Equal and IndexByte

Change-Id: Ibf3179d0903eb443c89b6d886802c36f8d199898
Reviewed-on: https://go-review.googlesource.com/70933Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/bytes/example_test.go

@@ -153,6 +153,14 @@ func ExampleCount() {
 	// 5
 }
 
+func ExampleEqual() {
+	fmt.Println(bytes.Equal([]byte("Go"), []byte("Go")))
+	fmt.Println(bytes.Equal([]byte("Go"), []byte("go")))
+	// Output:
+	// true
+	// false
+}
+
 func ExampleEqualFold() {
 	fmt.Println(bytes.EqualFold([]byte("Go"), []byte("go")))
 	// Output: true
@@ -188,6 +196,14 @@ func ExampleIndex() {
 	// -1
 }
 
+func ExampleIndexByte() {
+	fmt.Println(bytes.IndexByte([]byte("chicken"), byte('k')))
+	fmt.Println(bytes.IndexByte([]byte("chicken"), byte('g')))
+	// Output:
+	// 4
+	// -1
+}
+
 func ExampleIndexFunc() {
 	f := func(c rune) bool {
 		return unicode.Is(unicode.Han, c)