[mlir][docs] Out of date code in the tutorial "Adding a new Attribute or Type definition"

[ckoparkar]

Using the code given in Adding a new Attribute or Type definition to define a custom attribute results in an error:

error: Using a raw APInt parameter without a custom comparator is not supported
because an assert in the equality operator is triggered when the two APInts have
different bit widths. This can lead to unexpected crashes. Use an `APIntParameter`
or provide a custom comparator.

See #135970. We should update the document accordingly.

[llvmbot]

@llvm/issue-subscribers-mlir

Author: Chaitanya Koparkar (ckoparkar)

Using the code given in [Adding a new Attribute or Type definition](https://mlir.llvm.org/docs/DefiningDialects/AttributesAndTypes/#adding-a-new-attribute-or-type-definition) to define a custom attribute results in an error:

error: Using a raw APInt parameter without a custom comparator is not supported
because an assert in the equality operator is triggered when the two APInts have
different bit widths. This can lead to unexpected crashes. Use an `APIntParameter`
or provide a custom comparator.

See #135970. We should update the document accordingly.