[skip ci][Doc] Remove obsolete DiffusionParallelConfig in many example scripts (#6347)

Signed-off-by: Huang, Zeyu <11222265+fhfuih@users.noreply.github.com>
Co-authored-by: Hongsheng Liu <liuhongsheng4@huawei.com>

examples/offline_inference/diffusion/lingbot_world_v2_realtime.py

@@ -125,7 +125,6 @@ async def run(argv: Sequence[str] | None = None) -> Path:
     # require a CUDA-enabled vLLM installation.
     import torch
 
-    from vllm_omni.diffusion.data import DiffusionParallelConfig
     from vllm_omni.diffusion.models.lingbot_world.actions import LingBotCameraControlReducer
     from vllm_omni.entrypoints.async_omni import AsyncOmni
     from vllm_omni.experimental.ar_diffusion.consumer import ARDiffusionOmniTickConsumer
@@ -141,7 +140,7 @@ async def run(argv: Sequence[str] | None = None) -> Path:
         model=args.model,
         engine_backend="vllm_omni.experimental.ar_diffusion.engine.ARDiffusionEngine",
         enforce_eager=args.enforce_eager,
-        parallel_config=DiffusionParallelConfig(tensor_parallel_size=args.tensor_parallel_size),
+        tensor_parallel_size=args.tensor_parallel_size,
         max_num_seqs=1,
         model_config={
             "ar_diffusion_height": args.height,