fix doc after moving JsonGet to pipeline functions class

Author: jerrypeng7773

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

@@ -6,7 +6,6 @@ ConditionStep
 
 .. autoclass:: sagemaker.workflow.condition_step.ConditionStep
 
-.. autoclass:: sagemaker.workflow.condition_step.JsonGet
 
 Conditions
 ----------
@@ -55,6 +54,7 @@ Functions
 ---------
 
 .. autoclass:: sagemaker.workflow.functions.Join
+.. autoclass:: sagemaker.workflow.functions.JsonGet
 
 Parameters
 ----------