Update detections() self.t = tuple() (#2617)

* Update detections() self.t = tuple()

Fix multiple results.print() bug.

* Update experimental.py

* Update yolo.py

models/yolo.py

@@ -1,3 +1,5 @@
+# YOLOv5 YOLO-specific modules
+
 import argparse
 import logging
 import sys