Fix corrupted encoding in docstring

json2yolov5.py

@@ -38,14 +38,14 @@ class JSON2YOLO:
     The output is a folder with the following structure:
 
     dataset-YOLO
-    ├── classes.txt
-    ├── dataset_config.yml
-    ├── images
-    │   ├── train
-    │   └── val
-    └── labels
-        ├── train
-        └── val
+    ├── classes.txt
+    ├── dataset_config.yml
+    ├── images
+    │   ├── train
+    │   └── val
+    └── labels
+        ├── train
+        └── val
 
     The output will also be stored in a tarball with the same name as the
      output folder.