Add-support for commit description (#26704)

* fix

* update

* revert

* add dosctring

* good to go

* update

* add a test

tests/test_modeling_utils.py

@@ -1119,6 +1119,23 @@ class ModelPushToHubTester(unittest.TestCase):
         for p1, p2 in zip(model.parameters(), new_model.parameters()):
             self.assertTrue(torch.equal(p1, p2))
 
+    def test_push_to_hub_with_description(self):
+        config = BertConfig(
+            vocab_size=99, hidden_size=32, num_hidden_layers=5, num_attention_heads=4, intermediate_size=37
+        )
+        model = BertModel(config)
+        COMMIT_DESCRIPTION = """
+The commit description supports markdown synthax see:
+```python
+>>> form transformers import AutoConfig
+>>> config = AutoConfig.from_pretrained("bert-base-uncased")
+```
+"""
+        commit_details = model.push_to_hub(
+            "test-model", use_auth_token=self._token, create_pr=True, commit_description=COMMIT_DESCRIPTION
+        )
+        self.assertEqual(commit_details.commit_description, COMMIT_DESCRIPTION)
+
     @unittest.skip("This test is flaky")
     def test_push_to_hub_in_organization(self):
         config = BertConfig(