godoc: add missing copyright

Change-Id: Ic0256b511b4d4346702aeac18298614b1e8d5438
Reviewed-on: https://go-review.googlesource.com/9384
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

godoc/cmdline.go

@@ -1,6 +1,7 @@
 // Copyright 2013 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
+
 package godoc
 
 import (

godoc/cmdline_test.go

@@ -1,3 +1,7 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package godoc
 
 import (

godoc/server_test.go

@@ -1,3 +1,7 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 package godoc
 
 import (

godoc/tab.go

@@ -1,3 +1,7 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
 // TODO(bradfitz,adg): move to util
 
 package godoc