[main][Docs] Fix typos across documentation (#6728)

## Summary

Fix typos and improve grammar consistency across 50 documentation files.
 
### Changes include:
- Spelling corrections (e.g., "Facotory" → "Factory", "certainty" →
"determinism")
- Grammar improvements (e.g., "multi-thread" → "multi-threaded",
"re-routed" → "re-run")
- Punctuation fixes (semicolon consistency in filter parameters)
- Code style fixes (correct flag name `--num-prompts` instead of
`--num-prompt`)
- Capitalization consistency (e.g., "python" → "Python", "ascend" →
"Ascend")
- vLLM version: v0.15.0
- vLLM main:
9562912cea

---------

Signed-off-by: SlightwindSec <slightwindsec@gmail.com>

docs/source/tutorials/models/Qwen3-Omni-30B-A3B-Thinking.md

@@ -285,7 +285,7 @@ python3 -m vllm.entrypoints.openai.api_server --model $MODEL --tensor-parallel-s
 pip config set global.index-url https://mirrors.tuna.tsinghua.edu.cn/pypi/web/simple
 pip install -r vllm-ascend/benchmarks/requirements-bench.txt
 
-vllm bench serve --model $MODEL --dataset-name random --random-input 200 --num-prompt 200 --request-rate 1 --save-result --result-dir ./
+vllm bench serve --model $MODEL --dataset-name random --random-input 200 --num-prompts 200 --request-rate 1 --save-result --result-dir ./
 ```
 
 After execution, you can get the result, here is the result of `Qwen3-Omni-30B-A3B-Thinking` in vllm-ascend:0.13.0rc1 for reference only.