[mlir] Fix Tensor_InsertSliceOp description

[logan]

Summary

This commit fixes Tensor_InsertSliceOp size inputs/attributes description. Before this commit, the description says the size inputs/attributes denote the size of the return type.

But according to InsertSliceOpConstantArgumentFolder in lib/Dialect/Tensor/IR/TensorOps.cpp, the size inputs/attributes actually denote the size of the source type. After some off-line discussion with the author of TensorOps.td and TensorOps.cpp, it is a typo in the Op description.

This commit updates the Op description to match the actual usage.

[mravishankar]

Thanks!

mlir/include/mlir/Dialect/Tensor/IR/TensorOps.td

let description = [{
     of `source`.
 
     The insert_slice operation supports the following arguments:
 
     * source: the tensor that is inserted.
     * dest: the tensor into which the source tensor is inserted.
     * offsets: tensor-rank number of offsets into the `dest` tensor into which
                the slice is inserted.
-    * sizes: tensor-rank number of sizes which specify the sizes of the result
+    * sizes: tensor-rank number of sizes which specify the sizes of the source
              tensor type.
     * strides: tensor-rank number of strides that specify subsampling in each
                dimension.
 
     The representation based on offsets, sizes and strides support a
     partially-static specification via attributes specified through the
     `static_offsets`, `static_sizes` and `static_strides` arguments. A special
     sentinel value ShapedType::kDynamicSize and