Tutorial: Trigger Template Parameterization not working

[haiwu]

Describe the bug
Just follow the exact steps in Argo Events tutorial section 'Trigger Template Parameterization' at https://argoproj.github.io/argo-events/tutorials/02-parameterization/, and always getting 'hello world' output, instead of expected output of 'amazing!!'

To Reproduce
Steps to reproduce the behavior:
Just follow the exact steps in Argo Events tutorial section 'Trigger Template Parameterization' at https://argoproj.github.io/argo-events/tutorials/02-parameterization/

Expected behavior
Should have got expected output of 'amazing!!', but got 'hello world' output

Someone else already mentioned the same here: #3161.

If argo events no longer supports this use case, please remove this misleading section in the tutorial.

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