[Documentation] PR #25181 is undocumented

### Describe the documentation issue

Hi all,

I've been trying to build against ROCm for the better part of a week now, from [This Huggingface tutorial](https://huggingface.co/docs/optimum-onnx/onnxruntime/usage_guides/amdgpu#21-pytorch-with-rocm-support). Obviously that page is out of date and out of the domain of the Onnx team, but when the build failed I checked the [Onnx build documentation](https://onnxruntime.ai/docs/build/eps.html#amd-rocm) which claims the ROCm stack is still supported. `tools/ci_build/build.py` goes off without a hitch, up until `setup.py` is run as a subprocess, which tells me that `--use_rocm` isn't recognized. I looked at the source of `setup.py`, and couldn't figure out why all ROCm flag parsing had been removed. It wasn't until I checked the commit history and searched for "ROCm" that I found my answer.

Is there any reason `tools/ci_build/build.py` doesn't `raise` an `Exception` right off the bat? At the least, I would say the documentation website should mark the flags as deprecated, if some valid historical ROCm targets still exist

Here's the PR itself: https://github.com/microsoft/onnxruntime/pull/25181

### Page / URL

https://onnxruntime.ai/docs/build/eps.html#amd-rocm

Read PR #25181 and compare its ROCm changes with the AMD ROCm section at https://onnxruntime.ai/docs/build/eps.html#amd-rocm. Then inspect tools/ci_build/build.py and setup.py to understand how the unsupported --use_rocm flag is handled. Done means the documentation and reported build behavior agree about ROCm support and deprecated flags.

Written by the indexing model from the issue text.