testing/iotest: adjust adverbial imprecision in package comment

Fixes #2959.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5651053

diff --git a/src/pkg/testing/iotest/reader.go b/src/pkg/testing/iotest/reader.go
index ab8dc31a1f7b2dfe093f382413c8d1f9f83338ae..441b9102d94d7a59623efa72bbf9cebea8af9ec1 100644 (file)
--- a/src/pkg/testing/iotest/reader.go
+++ b/src/pkg/testing/iotest/reader.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 iotest implements Readers and Writers useful only for testing.
+// Package iotest implements Readers and Writers useful mainly for testing.
 package iotest
 
 import (