message: Update autogenerated Operators doc
diff: </dl>
  +* **Pad**
  +
  + Given DATA tensor, paddings, mode, and value.
  +
  + Example:
  + Insert 0 paddings to the beginning of the second dimension.
  +
  + DATA = [
  + [1.0, 1.2],
  + [2.3, 3.4],
  + [4.5, 5.7],
  + ]
  + paddings = [0, 0, 2, 0]
  +
  + OUTPUT = [
  + [
  + [0.0, 0.0, 1.0, 1.2],
  + [0.0, 0.0, 2.3, 3.4],
  + [0.0, 0.0, 4.5, 5.7],
  + ],
  + ]
  + * **attribute**:
  + <dl>
  + <dt>mode</dt>
  + <dd>Three modes: constant(default), reflect, replicate</dd>
  + <dt>paddings</dt>
  + <dd>List of integers indicate the padding sizes, paddings's length should be the double of input's dimension. The order should be axis_0_begin, axis_0_end, axis_1_begin, ..., axis_n_begin, axis_n_end, n is input's dimension.</dd>
  + <dt>value</dt>
  + <dd>One float, indicates the value to be filled, default is 0</dd>
  + </dl>
  + * **input**:
  + <dl>
  + <dt>DATA</dt>
  + <dd>Input tensor.</dd>
  + </dl>
  + * **output**:
  + <dl>
  + <dt>OUTPUT</dt>
  + <dd>Tensor after padding.</dd>
  + </dl>
  +
  +
  * **Pow**
  Pow takes input data (Tensor<T>) and an argument exponent, and
  