code review 5755051: doc: fix typos in laws_of_reflection article.

doc/progs/interface.go

+// Copyright 2012 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.
+
+// This file contains the code snippets included in "The Laws of Reflection."
+
 package main
 
 import (
         "bufio"
         "bytes"
         "io"
         "os"
 )
 
 type MyInt int
@@ skipping 36 matching lines @@
         w = r.(io.Writer)
         // STOP OMIT
         var empty interface{}
         empty = w
         // STOP OMIT
         return empty, err
 }
 
 func main() {
 }