update voc.yaml

data/voc.yaml

 # PASCAL VOC dataset http://host.robots.ox.ac.uk/pascal/VOC/
-# Download command: bash yolov5/data/get_voc.sh
+# Download command: bash ./data/get_voc.sh
 # Train command: python train.py --data voc.yaml
 # Dataset should be placed next to yolov5 folder:
 #   /parent_folder
@@ -14,5 +14,5 @@ val: ../VOC/images/val/
 nc: 20
 
 # class names
-names: ['aeroplane', 'bicycle','bird','boat','bottle','bus','car','cat','chair','cow','diningtable','dog','horse',
-        'motorbike','person','pottedplant','sheep','sofa','train','tvmonitor']
+names: ['aeroplane', 'bicycle', 'bird', 'boat', 'bottle', 'bus', 'car', 'cat', 'chair', 'cow', 'diningtable', 'dog',
+        'horse', 'motorbike', 'person', 'pottedplant', 'sheep', 'sofa', 'train', 'tvmonitor']