message: Adding an example description to ReadFile op.
diff: @@ -7,4 +7,12 @@ op {
  name: "read_file"
  deprecation_version: 2
  }
  + description: <<END
  +For example:
  +>>> with open('test_file.txt', 'w') as test_file:
  +... test_file.write('Hello Tensorflow')
  +16
  +>>> tf.io.read_file('test_file.txt')
  +<tf.Tensor: id=..., shape=(), dtype=string, numpy=b'Hello Tensorflow'>
  +END
  }
  