fix(batch): docstring fix for success_handler() record parameter (aws-powertools#1202)

Author: peterschutt

aws_lambda_powertools/utilities/batch/base.py

@@ -116,7 +116,7 @@ def success_handler(self, record, result: Any) -> SuccessResponse:
         Parameters
         ----------
         record: Any
-            record that failed processing
+            record that succeeded processing
         result: Any
             result from record handler