polish code with new pre-commit rule (#2923)

docs/get_started/installation/hygon_dcu.md

@@ -37,6 +37,7 @@ image.sourcefind.cn:5000/dcu/admin/base/custom:fastdeploy2.0.0-kylinv10-dtk25.04
 ```
 
 ## 2. Start service
+
 ```bash
 export FD_ATTENTION_BACKEND="BLOCK_ATTN"
 python -m fastdeploy.entrypoints.openai.api_server \
@@ -47,7 +48,7 @@ python -m fastdeploy.entrypoints.openai.api_server \
     --gpu-memory-utilization=0.8
 ```
 
-#### Send requests
+### Send requests
 
 Send requests using either curl or Python
 
@@ -78,4 +79,4 @@ response = client.chat.completions.create(
     stream=False,
 )
 print(response)
-```
+```