Update README.md

Author: AllentDan

lesson7-Detection/README.md

@@ -524,9 +524,11 @@ Predict(model, image, true, 0.1, 0.3);
 The picture used is as shown below
 
 ![](https://raw.githubusercontent.com/AllentDan/ImageBase/main/detection/2007_005331.jpg)
+
 It will be found that the forecast results are as follows:
 
 ![](https://raw.githubusercontent.com/AllentDan/ImageBase/main/detection/2007_005331_pred_coco.jpg)
+
 The result analysis has the following two conclusions:
 - The detection box is output, and the prediction function is likely to be correct;
 - There are some false detections. Increasing the confidence threshold may be improved, but the detection will be missed. This is caused by the inconsistency between the preprocessing strategy used in the training of the .pt file and the preprocessing strategy used in the code prediction of this article.