message: Fix link in avro reader notebook
  Correct the link to Avro Reader tests in notebook
diff: "id": "IF_kYz_o2DH4"
  },
  "source": [
  - "A comprehensive set of examples of Avro dataset API is provided within <a target=\"_blank\" href=\"https://github.com/tensorflow/io/blob/master/tests/test_parse_avro_eager.py#L580r\">the tests.</a>\n"
  + "A comprehensive set of examples of Avro dataset API is provided within <a target=\"_blank\" href=\"https://github.com/tensorflow/io/blob/master/tests/test_parse_avro.py#L437\">the tests</a>.\n"
  ]
  }
  ],
  