Update detection_en.md

doc/doc_en/detection_en.md

@@ -51,7 +51,7 @@ python3 tools/train.py -c configs/det/det_mv3_db.yml  \
          -o Global.pretrained_model=./pretrain_models/MobileNetV3_large_x0_5_pretrained
 ```
 
-In the above instruction, use `-c` to select the training to use the `configs/det/det_db_mv3.yml` configuration file.
+In the above instruction, use `-c` to select the training to use the `configs/det/det_mv3_db.yml` configuration file.
 For a detailed explanation of the configuration file, please refer to [config](./config_en.md).
 
 You can also use `-o` to change the training parameters without modifying the yml file. For example, adjust the training learning rate to 0.0001