doc: add tuning step get_top_model_s3_uri and callback step to doc (#2516)

Co-authored-by: Ahsan Khan <[email protected]>
Co-authored-by: apogupta2018 <[email protected]>

Author: 3 people

doc/workflows/pipelines/sagemaker.workflow.pipelines.rst

@@ -109,13 +109,17 @@ Steps
 
 .. autoclass:: sagemaker.workflow.steps.TrainingStep
 
-.. autoclass:: sagemaker.workflow.steps.CreateModelStep
+.. autoclass:: sagemaker.workflow.steps.TuningStep
+
+.. autofunction:: sagemaker.workflow.steps.TuningStep.get_top_model_s3_uri
 
 .. autoclass:: sagemaker.workflow.steps.TransformStep
 
 .. autoclass:: sagemaker.workflow.steps.ProcessingStep
 
-.. autoclass:: sagemaker.workflow.steps.TuningStep
+.. autoclass:: sagemaker.workflow.steps.CreateModelStep
+
+.. autoclass:: sagemaker.workflow.callback_step.CallbackStep
 
 Utilities
 ---------