Improve package doc.

pkg/diff/doc.go

@@ -1,2 +0,0 @@
-// Package diff runs system diff to compare resource collections
-package diff

pkg/diff/rundiff.go

@@ -1,3 +1,20 @@
+/*
+Copyright 2018 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Package diff runs system `diff` to compare resource collections.
 package diff
 
 import (