Update README.md (#13283)

* Update README.md

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

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---------

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>
Co-authored-by: UltralyticsAssistant <web@ultralytics.com>

segment/val.py

@@ -121,7 +121,7 @@ def process_batch(detections, labels, iouv, pred_masks=None, gt_masks=None, over
         detections (array[N, 6]), x1, y1, x2, y2, conf, class
         labels (array[M, 5]), class, x1, y1, x2, y2
     Returns:
-        correct (array[N, 10]), for 10 IoU levels
+        correct (array[N, 10]), for 10 IoU levels.
     """
     if masks:
         if overlap: