message: Remove duplicate example code embedded in the streamingaead package comment.
  This will remove the improperly rendered copy of the exmaple in the godoc.
diff: // Package streamingaead provides implementations of the streaming AEAD primitive.
  //
  -// AEAD encryption assures the confidentiality and authenticity of the data. This primitive is CPA secure.
  -//
  -// Example:
  -//
  -// import (
  -// "io"
  -// "io/ioutil"
  -// "log"
  -// "os"
  -// "path/filepath"
  -//
  -// "github.com/google/tink/go/aead"
  -// "github.com/google/tink/go/keyset"
  -// "github.com/google/tink/go/streamingaead"
  -// )
  -//
  -// func main() {
  -// dir, err := ioutil.TempDir("", "streamingaead")
  -// if err != nil {
  -// log.Fatal(err)
  -// }
  -// defer os.RemoveAll(dir)
  -//
  -// var (
  -// srcFilename = filepath.Join(dir, "plaintext.src")
  -// ctFilename = filepath.Join(dir, "ciphertext.bin")
  -// dstFilename = filepath.Join(dir, "plaintext.dst")
  -// )
  -//
  -// if err := ioutil.WriteFile(srcFilename, []byte("this data needs to be encrypted"), 0666); err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// kh, err := keyset.NewHandle(streamingaead.AES256GCMHKDF4KBKeyTemplate())
  -// if err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// a, err := streamingaead.New(kh)
  -// if err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// srcFile, err := os.Open(srcFilename)
  -// if err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// ctFile, err := os.Create(ctFilename)
  -// if err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// w, err := a.NewEncryptingWriter(ctFile, []byte("associated data"))
  -// if err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// if _, err := io.Copy(w, srcFile); err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// if err := w.Close(); err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// if err := ctFile.Close(); err != nil {
  -// log.Fatal(err)
  -// }
  -// if err := srcFile.Close(); err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// // Decrypt encrypted file.
  -//
  -// ctFile, err = os.Open(ctFilename)
  -// if err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// dstFile, err := os.Create(dstFilename)
  -// if err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// r, err := a.NewDecryptingReader(ctFile, []byte("associated data"))
  -// if err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// if _, err := io.Copy(dstFile, r); err != nil {
  -// log.Fatal(err)
  -// }
  -//
  -// if err := dstFile.Close(); err != nil {
  -// log.Fatal(err)
  -// }
  -// if err := ctFile.Close(); err != nil {
  -// log.Fatal(err)
  -// }
  -// }
  +// AEAD encryption assures the confidentiality and authenticity of the data.
  +// This primitive is CPA secure.
  package streamingaead
  import (
  