[ROCm] Update doc for ROCm 5.4 (#14494)
### Description
1. Delete preview label for ROCm/MIGraphX and update ROCm/MIGraphX
supported architecture. https://peixuanzuo.github.io/onnxruntime/
2. Update rocm training guide to ROCm5.4.
https://peixuanzuo.github.io/onnxruntime/docs/build/training.html#gpu--rocm
