[PyOV] Fix docs and add test for Model._get_raw_address (#20109)

src/bindings/python/src/pyopenvino/graph/model.cpp

@@ -1004,7 +1004,9 @@ void regclass_graph_Model(py::module m) {
             return reinterpret_cast<uint64_t>(&self);
         },
         R"(
-        Returns raw address of the Model object.
+        Returns a raw address of the Model object from C++.
+        
+        Use this function in order to compare underlying C++ addresses instead of using `__eq__` in Python.
 
         :return: a raw address of the Model object.
         :rtype: int

src/bindings/python/tests/test_runtime/test_model.py

@@ -657,3 +657,12 @@ def test_model_add_remove_result_parameter_sink():
     assert ["Assign"] == [sink.get_type_name() for sink in assign_nodes]
     model.remove_sink(assign)
     assert len(model.sinks) == 0
+
+
+def test_model_get_raw_address():
+    model = generate_add_model()
+    model_with_same_addr = model
+    model_different = generate_add_model()
+
+    assert model._get_raw_address() == model_with_same_addr._get_raw_address()
+    assert model._get_raw_address() != model_different._get_raw_address()