[Doc][v0.18.0] Fix documentation formatting and improve code examples (#8701)

### What this PR does / why we need it?
This PR fixes various documentation issues and improves code examples
throughout the project.

Signed-off-by: MrZ20 <2609716663@qq.com>

tests/e2e/multicard/2-cards/test_qwen3_moe.py

@@ -80,7 +80,7 @@ async def test_qwen3_moe_w8a8_distributed_tp2_ep_dynamic_eplb():
     port = get_open_port()
     compilation_config = json.dumps({"cudagraph_capture_sizes": [8]})
     server_args = [
-        "--max_model_len",
+        "--max-model-len",
         "8192",
         "--tensor_parallel_size",
         "2",