Fixed missing single quote in line 367

Author: bjcmit

articles/machine-learning/tutorial-convert-ml-experiment-to-production.md

@@ -364,7 +364,7 @@ class TestTrain:
                      "test": {"X": [[4, 5, 6]], "y": [0]}}
         test_alpha = 0.5
         mock_ridge_fit = mocker.patch('Ridge.fit')
-        mock_ridge_predict = mocker.patch(Ridge.predict')
+        mock_ridge_predict = mocker.patch('Ridge.predict')
 
         # Act
         train_model(test_data, test_alpha)