fix docs (#5124)

torchvision/models/detection/ssdlite.py

@@ -252,7 +252,7 @@ def ssdlite320_mobilenet_v3_large(
         "detections_per_img": 300,
         "topk_candidates": 300,
         # Rescale the input in a way compatible to the backbone:
-        # The following mean/std rescale the data from [0, 1] to [-1, -1]
+        # The following mean/std rescale the data from [0, 1] to [-1, 1]
         "image_mean": [0.5, 0.5, 0.5],
         "image_std": [0.5, 0.5, 0.5],
     }