Replace misspelled function name in detection.core.py

Changed the function name from 'from_mmdet' to 'from_mmdetection'. This was done to correct a misspelling which might otherwise lead to confusion and potential errors when calling the function.

supervision/detection/core.py

@@ -326,7 +326,7 @@ class Detections:
             >>> inferencer = DetInferencer(model_name, checkpoint, device)
             >>> mmdet_result = inferencer(SOURCE_IMAGE_PATH, out_dir='./output',
             ...                           return_datasamples=True)["predictions"][0]
-            >>> detections = sv.Detections.from_mmdet(mmdet_result)
+            >>> detections = sv.Detections.from_mmdetection(mmdet_result)
             ```
         """