message: Fix broken link of tf.train.Example in recurrent_quickdraw.md
  In recurrent_quickdraw.md, the link `${tf.train.Example}` is
  not rendered correctly. This fix fixes the broken link with
  correct rendering. Now the link is rendered the same way
  as tf.train.Example in api_guides/python/reading_data.md and extend/new_data_formats.md
diff: @@ -109,7 +109,8 @@ This download will take a while and download a bit more than 23GB of data.
  To convert the `ndjson` files to
  @{$python/python_io#tfrecords_format_details$TFRecord} files containing
  -${tf.train.Example} protos run the following command.
  +[`tf.train.Example`](https://www.tensorflow.org/code/tensorflow/core/example/example.proto)
  +protos run the following command.
  ```shell
  python create_dataset.py --ndjson_path rnn_tutorial_data \
  