[mlir][TD] Fix the order of return handles (#76929)

Replace (in tests and docs):

    %forall, %tiled = transform.structured.tile_using_forall

with (updated order of return handles):

    %tiled, %forall = transform.structured.tile_using_forall

Similar change is applied to (in the TD tutorial):

    transform.structured.fuse_into_containing_op

This update makes sure that the tests/documentation are consistent with
the Op specifications. Follow-up for #67320 which updated the order of
the return handles for `tile_using_forall`.