Fix tutorial comment typing error (#698)

Author: BoyanYK

advanced_source/super_resolution_with_onnxruntime.py

@@ -142,7 +142,7 @@ def _initialize_weights(self):
                   "super_resolution.onnx",   # where to save the model (can be a file or file-like object)
                   export_params=True,        # store the trained parameter weights inside the model file
                   opset_version=10,          # the ONNX version to export the model to
-                  do_constant_folding=True,  # wether to execute constant folding for optimization
+                  do_constant_folding=True,  # whether to execute constant folding for optimization
                   input_names = ['input'],   # the model's input names
                   output_names = ['output'], # the model's output names
                   dynamic_axes={'input' : {0 : 'batch_size'},    # variable lenght axes