test/interface: document tests
Most already had comments (yay); adjusted for consistency.
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/5676102
diff --git a/test/interface/struct.go b/test/interface/struct.go
index 3c9d01d..f60819c 100644
--- a/test/interface/struct.go
+++ b/test/interface/struct.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.
-// Interface values containing structures.
+// Test interface values containing structures.
package main
