Update beginner_source/onnx/onnx_registry_tutorial.py

Co-authored-by: Svetlana Karslioglu <svekars@meta.com>

Author: titaiwangms

beginner_source/onnx/onnx_registry_tutorial.py

@@ -58,10 +58,10 @@
 #    ``RuntimeErrorWithDiagnostic: Unsupported FX nodes: {'call_function': ['aten.add.Tensor']}. ``
 #
 # To support unsupported ATen operators, we need two things:
-# 1. The unsupported ATen operator namespace, operator name, and the
-#    corresponding overload. (e.g. <namespace>::<op_name>.<overload> - aten::add.Tensor),
+# * The unsupported ATen operator namespace, operator name, and the
+#    corresponding overload (for example ``<namespace>::<op_name>.<overload> - aten::add.Tensor``),
 #    which can be found in the error message.
-# 2. The implementation of the operator in `onnxscript <https://github.com/microsoft/onnxscript>`__.
+# * The implementation of the operator in `ONNX Script <https://github.com/microsoft/onnxscript>`__.
 #