minor fix

docs/mkdocs.yml

@@ -2,6 +2,7 @@ site_name: PaddleSlim Docs
 repo_url: https://github.com/PaddlePaddle/PaddleSlim
 nav:
 - Home: index.md
+- 模型库: model_zoo.md
 - API:
   - 量化: api/quantization_api.md
   - 剪枝与敏感度:  api/prune_api.md
@@ -17,7 +18,6 @@ nav:
   - SA搜索: tutorials/nas_demo.md
   - 知识蒸馏: tutorials/distillation_demo.md
 - 算法原理: algo/algo.md
-- 模型库: model_zoo.md
 
 theme:
     name: readthedocs