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/convert2.go b/test/interface/convert2.go
index 4833e84..4a3ec8a 100644
--- a/test/interface/convert2.go
+++ b/test/interface/convert2.go
@@ -4,8 +4,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
-// Check that static interface conversion of
-// interface value nil succeeds.
+// Test static interface conversion of interface value nil.
package main
