improve doc, test=document_fix

docs/zh_CN/tutorials/install.md

@@ -74,7 +74,7 @@ git clone https://gitee.com/paddlepaddle/PaddleClas.git -b release/2.0
 
 **安装Python依赖库：**
 
-Python依赖库在[requirements.txt](https://github.com/PaddlePaddle/PaddleClas/blob/release/2.0/requirements.txt)中给出，可通过如下命令安装：
+Python依赖库在`requirements.txt`中给出，可通过如下命令安装：
 
 ```bash
 pip3 install --upgrade -r requirements.txt -i https://mirror.baidu.com/pypi/simple

docs/zh_CN/tutorials/quick_start.md

@@ -181,8 +181,7 @@ TRAIN:
 
 ```shell
 export CUDA_VISIBLE_DEVICES=0
-python3 tools/train.py \
-        -c ./configs/quick_start/R50_vd_distill_MV3_large_x1_0.yaml
+python3 tools/train.py -c ./configs/quick_start/R50_vd_distill_MV3_large_x1_0.yaml
 ```
 
 最终flowers102验证集上的精度为0.9647，结合更多的无标签数据，使用教师模型进行知识蒸馏，MobileNetV3的精度涨幅高达6.47\%。