Add clarity to note on why we use a trampoline to bind add_child.

python_binding/graph/pybind_Node.cpp

@@ -66,7 +66,8 @@ void init_Node(py::module& m) {
         [](Node &self, std::shared_ptr<GraphView> other_graph, const IOIndex_t out_id=0,
                         py::object other_in_id = py::none()) {
             std::pair<NodePtr, IOIndex_t> cpp_other_in_id;
-            // Note: default arg nullptr to allow python binding
+            // Note: PyBind on windows does not support conversion of nullptr -> std::shared_ptr, using this trampoline to change the default arg to a py::none(). If signature change, we would be able to directly bind the function.
+
             if (other_in_id.is_none()) {
                 cpp_other_in_id = std::pair<NodePtr, IOIndex_t>(nullptr, gk_IODefaultIndex);
             }else{