[1/2/N] Enable pymarkdown and python __init__ for lint system (#2011)

### What this PR does / why we need it?
1. Enable pymarkdown check
2. Enable python `__init__.py` check for vllm and vllm-ascend
3. Make clean code

### How was this patch tested?


- vLLM version: v0.9.2
- vLLM main:
29c6fbe58c

---------

Signed-off-by: wangli <wangli858794774@gmail.com>

docs/source/developer_guide/evaluation/using_lm_eval.md

@@ -1,7 +1,7 @@
 # Using lm-eval
 This document will guide you have a accuracy testing using [lm-eval](https://github.com/EleutherAI/lm-evaluation-harness).
 
-##  1. Run docker container
+## 1. Run docker container
 
 You can run docker container on a single NPU:
 
@@ -36,6 +36,7 @@ Install lm-eval in the container.
 ```bash
 pip install lm-eval
 ```
+
 Run the following command:
 
 ```