Update prediction Results docs (#4139)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

ultralytics/utils/ops.py

@@ -61,10 +61,12 @@ def coco80_to_coco91_class():  #
     For details see https://tech.amikelive.com/node-718/what-object-categories-labels-are-in-coco-dataset/.
 
     Example:
+        ```python
         a = np.loadtxt('data/coco.names', dtype='str', delimiter='\n')
         b = np.loadtxt('data/coco_paper.names', dtype='str', delimiter='\n')
         x1 = [list(a[i] == b).index(True) + 1 for i in range(80)]  # darknet to coco
         x2 = [list(b[i] == a).index(True) if any(b[i] == a) else None for i in range(91)]  # coco to darknet
+        ```
     """
     return [
         1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 31, 32, 33, 34,