update dataset comments

data/get_coco2017.sh

@@ -1,12 +1,13 @@
 #!/bin/bash
 # COCO 2017 dataset http://cocodataset.org
 # Download command: bash yolov5/data/get_coco2017.sh
-# Train command: python train.py --data ./data/coco.yaml
-# Dataset should be placed next to yolov5 folder:
+# Train command: python train.py --data coco.yaml
+# Default dataset location is next to /yolov5:
 #   /parent_folder
 #     /coco
 #     /yolov5
 
+
 # Download labels from Google Drive, accepting presented query
 filename="coco2017labels.zip"
 fileid="1cXZR_ckHki6nddOmcysCuuJFM--T-Q6L"