fixes #12961. Add example of standard output of a step as output para…

…meter

Signed-off-by: Sandeep Khurana <skhurana333@gmail.com>

docs/walk-through/output-parameters.md

@@ -62,7 +62,7 @@ Given a `task`, called `log-int`, `result` would then be accessible as `{{ tasks
 
 #### Output parameter from a standard output of a step
 
-Step's stdout as output parameter.
+Standard output of step as output parameter.
 
 ```yaml
 apiVersion: argoproj.io/v1alpha1