Update torch.export tutorial for 2.2 (#2709)

* update torch.export tutorial for 2.2
* Update intermediate_source/torch_export_tutorial.py

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Co-authored-by: Svetlana Karslioglu <[email protected]>

Author: williamwen42

.jenkins/validate_tutorials_built.py

@@ -27,7 +27,6 @@
     "intermediate_source/mnist_train_nas",  # used by ax_multiobjective_nas_tutorial.py
     "intermediate_source/fx_conv_bn_fuser",
     "intermediate_source/_torch_export_nightly_tutorial",  # does not work on release
-    "intermediate_source/torch_export_tutorial", # Enable when fixed for 2.2
     "advanced_source/super_resolution_with_onnxruntime",
     "advanced_source/ddp_pipeline",  # requires 4 gpus
     "advanced_source/usb_semisup_learn", # in the current form takes 140+ minutes to build - can be enabled when the build time is reduced