[llvm] [mlir] [mlir][ods] Add documentation on how to use sharded op definitions (NFC) (PR #89664)

[Daniel Chen via llvm-commits]

DanielCChen wrote:

> The tool likely should accept the same sets of flags as TableGen, considering it is using the tablegen() macro. Feel free to send a patch.

Thanks for responding. I am afraid I am not familiar enough to the code in this PR to create a patch. Would be either @Mogball or you able to please provide a fix?

https://github.com/llvm/llvm-project/pull/89664