message: Update HOWTO so that the variables are correctly named in the example code on reading and writing keysets.
  GitOrigin-RevId:
diff: @@ -349,18 +349,18 @@ func main() {
  // Write encrypts the keyset handle with the master key and
  // writes to the io.Writer implementation(memKeyset)
  // We recommend you encrypt the keyset handle before persisting.
  - if err := h.Write(memKeyset, masterKey); err != nil {
  + if err := kh.Write(memKeyset, masterKey); err != nil {
  // handle error
  }
  // Read reads the encrypted keyset handle back from the io.Reader implementation
  // and decrypts it using the master key.
  - h2, err := keyset.Read(memKeyset, masterKey)
  + kh2, err := keyset.Read(memKeyset, masterKey)
  if err != nil {
  // handle error
  }
  - if !proto.Equal(h.Keyset(), h2.Keyset()) {
  + if !proto.Equal(kh.Keyset(), kh2.Keyset()) {
  // handle error
  }
  }
  