### What this PR does / why we need it? add faqs:install vllm-ascend will overwrite existing torch-npu ### Does this PR introduce _any_ user-facing change? ### How was this patch tested? - vLLM version: v0.10.2 - vLLM main: https://github.com/vllm-project/vllm/commit/releases/v0.11.0 Signed-off-by: weiguihua2 <weiguihua2@huawei.com>