Apply suggestions from code review

Author: Borda

tests/tests_pytorch/core/test_lightning_module.py

@@ -119,7 +119,7 @@ def test_1_optimizer_toggle_model():
     assert not model._param_requires_grad_state
 
 
-def test_1_optimizer_toggle_model_context_manager():
+def test_optimizer_toggle_model_context_manager():
     """Test toggle_model runs when only one optimizer is used."""
     model = BoringModel()
     trainer = Mock()