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

…put parameter

docs/walk-through/output-parameters.md

@@ -60,7 +60,7 @@ Outputs of a `script` are assigned to standard output and captured in the `resul
 Container steps and tasks also have their standard output captured in the `result` parameter.
 Given a `task`, called `log-int`, `result` would then be accessible as `{{ tasks.log-int.outputs.result }}`. If using [steps](steps.md), substitute `tasks` for `steps`: `{{ steps.log-int.outputs.result }}`.
 
-#### Output parameter from a step
+#### Output parameter from a standard output of a step
 
 Step's stdout as output parameter.