internal: fix typo

Change-Id: I95276a7323b126e132d678978987d89fbe4d851d
GitHub-Last-Rev: f16fe15
GitHub-Pull-Request: #14
Reviewed-on: https://go-review.googlesource.com/c/playground/+/390416
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Trust: Alberto Donizetti <alb.donizetti@gmail.com>
Reviewed-by: Alex Rakoczy <alex@golang.org>

Author: cuishuang

internal/gcpdial/gcpdialtool/gcpdialtool.go

@@ -3,7 +3,7 @@
 // license that can be found in the LICENSE file.
 
 // The gcpdialtool command is an interactive validation tool for the
-// gcpdial packge.
+// gcpdial package.
 package main
 
 import (