### What this PR does / why we need it? Add quickstart doctest CI ### Does this PR introduce _any_ user-facing change? no ### How was this patch tested? - CI passed - Run `/vllm-ascend/tests/e2e/run_doctests.sh` Related: https://github.com/vllm-project/vllm-ascend/issues/725 Signed-off-by: Yikun Jiang <yikunkero@gmail.com>