[Fix] fix filename typo (#549)

docs/en/user_guides/models.md

@@ -100,7 +100,7 @@ We have provided several examples for API-based models. Please refer to
 
 ```bash
 configs
-├── eval_zhihu.py
+├── eval_zhipu.py
 ├── eval_xunfei.py
 └── eval_minimax.py
 ```

docs/zh_cn/user_guides/models.md

@@ -92,7 +92,7 @@ models = [
 
 ```bash
 configs
-├── eval_zhihu.py
+├── eval_zhipu.py
 ├── eval_xunfei.py
 └── eval_minimax.py
 ```