io/i2c: fix typo

Change-Id: I3df4075f4480dbfe7e06bfdfa019d2f3e52ea69f
Reviewed-on: https://go-review.googlesource.com/22522
Reviewed-by: Minux Ma <minux@golang.org>
diff --git a/io/i2c/i2c.go b/io/i2c/i2c.go
index ef626d1..f48a213 100644
--- a/io/i2c/i2c.go
+++ b/io/i2c/i2c.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package i2c allows users to read from an write to a slave I2C device.
+// Package i2c allows users to read from and write to a slave I2C device.
 package i2c // import "golang.org/x/exp/io/i2c"
 
 import (