test: commentary for [h-m]*.go

R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/5674112
diff --git a/test/method3.go b/test/method3.go
index 5711ffd..fd64771 100644
--- a/test/method3.go
+++ b/test/method3.go
@@ -4,7 +4,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// test that methods on slices work
+// Test methods on slices.
 
 package main