message: Update to new sugared form in doc
diff: @@ -99,31 +99,13 @@ def TF_AddOp : Op<"tf.Add", [NoSideEffect]>,
  The inputs and result must be of the same elemental type.
  }];
  - // FIXME: This is very much not the final form! There is a lot of boilerplate
  - // that will be removed in future iterations.
  let reference = [{
  - // Different Bindable ivs, one per loop in the loop nest.
  - auto ivs = makeBindables(shapeA.size());
  - Bindable zero, one;
  - // Same bindable, all equal to `zero`.
  - SmallVector<Bindable, 8> zeros(ivs.size(), zero);
  - // Same bindable, all equal to `one`.
  - SmallVector<Bindable, 8> ones(ivs.size(), one);
  - Bindable A, B, C;
  - Stmt scalarA, scalarB, tmp;
  + auto ivs = makeBindables(lhsShape.size());
  block = edsc::Block({
  - ForNest(ivs, zeros, shapeA, ones, {
  - scalarA = load(A, ivs),
  - scalarB = load(B, ivs),
  - tmp = scalarA + scalarB,
  - store(tmp, C, ivs)
  - }),
  - });
  - emitter.bindConstant<ConstantIndexOp>(zero, 0)
  - .bindConstant<ConstantIndexOp>(one, 1)
  - .bind(A, memRefA)
  - .bind(B, memRefB)
  - .bind(C, memRefC);
  + ForNest(ivs, 0, lhsShape, 1, {
  + result[ivs] = lhs[ivs] + rhs[ivs]
  + })});
  + }
  }];
  }
  ```
  