[None][Doc] Polish parallelism doc and add wide ep sectionwq.

[nv-guomingz]

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[kaiyux]

I think we are not actively testing on LLaMA4 and Qwen3, not sure if we should remove those models.

[kaiyux]

Seems that this part is largely duplicated with the wide EP README? https://github.com/NVIDIA/TensorRT-LLM/tree/main/examples/wide_ep#overview Should we consider just putting the pointer here to reduce future maintenance efforts?