doc: fix broken link to moved notebook (#1940)

Co-authored-by: Ajay Karpur <[email protected]>

Author: metrizable

doc/overview.rst

@@ -672,7 +672,7 @@ You can install all necessary for this feature dependencies using pip:
 For more detailed examples of running hyperparameter tuning jobs, see:
 
 - `Using the TensorFlow estimator with hyperparameter tuning <https://github.com/awslabs/amazon-sagemaker-examples/blob/master/hyperparameter_tuning/tensorflow_mnist/hpo_tensorflow_mnist.ipynb>`__
-- `Bringing your own estimator for hyperparameter tuning <https://github.com/awslabs/amazon-sagemaker-examples/blob/master/hyperparameter_tuning/r_bring_your_own/hpo_r_bring_your_own.ipynb>`__
+- `Bringing your own estimator for hyperparameter tuning <https://github.com/awslabs/amazon-sagemaker-examples/blob/master/hyperparameter_tuning/r_bring_your_own/tune_r_bring_your_own.ipynb>`__
 - `Analyzing results <https://github.com/awslabs/amazon-sagemaker-examples/blob/master/hyperparameter_tuning/analyze_results/HPO_Analyze_TuningJob_Results.ipynb>`__
 
 You can also find these notebooks in the **Hyperprameter Tuning** section of the **SageMaker Examples** section in a notebook instance.