message: clarified summary, description of tf.bitwise.invert
diff: op {
  graph_op_name: "Invert"
  - summary: "Flips all bits elementwise."
  + summary: "Invert (flip) each bit of supported types; for example, type `uint8` value 01010101 becomes 10101010."
  description: <<END
  -The result will have exactly those bits set, that are not set in `x`. The
  -computation is performed on the underlying representation of x.
  +Flip each bit of supported types. For example, type `int8` (decimal 2) binary 00000010 becomes (decimal -3) binary 11111101.
  +This operation is performed on each element of the tensor argument `x`.
  END
  }
  