Add docstring usage for optional arguments

Signed-off-by: Kheil-Z <[email protected]>

Author: Kheil-Z

monai/networks/nets/voxelmorph.py

@@ -405,6 +405,12 @@ class serves as a wrapper that concatenates the input pair of moving and fixed i
         fixed = torch.randn(1, 1, 160, 192, 224)
         warped, ddf = net(moving, fixed)
 
+        # Example with optional moving_seg and fixed_keypoints
+        moving_seg = torch.randint(0, 4, (1, 1, 160, 192, 224)).float()
+        moving_seg = one_hot(moving_seg, num_classes=4)
+        fixed_keypoints = torch.tensor([[[80, 96, 112], [40, 48, 56]]]).float()
+        warped_img, warped_seg, warped_keypoints, ddf = net( moving, fixed, moving_seg=moving_seg, fixed_keypoints=fixed_keypoints )
+
     """
 
     def __init__(