docs: public void writer() throws IOException {
      // [START writer]
      byte[] content = "Hello, World!".getBytes(UTF_8);
      try (WriteChannel writer = blob.writer()) {
        try {
          writer.write(ByteBuffer.wrap(content, 0, content.length));
        } catch (Exception ex) {
          // handle exception
        }
      }
      // [END writer]
    }