message: docs(example): fix send file to only send range of buffer read into
diff: @@ -103,7 +103,7 @@ impl Service for ResponseExamples {
  tx_body.close().expect("panic closing");
  break;
  } else {
  - let chunk: Chunk = buf.to_vec().into();
  + let chunk: Chunk = buf[0..n].to_vec().into();
  match tx_body.send(Ok(chunk)).wait() {
  Ok(t) => { tx_body = t; },
  Err(_) => { break; }
  