[Docs] Add error handling example for Raw containers

[machichima]

Description

In Raw container, we cannot raise error and trigger retries by simply using raise. Instead, the retry will be triggered when the container task write the _ERROR file to its output folder. This should be documented in the raw container example.

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[welcome]

Thank you for opening your first issue here! 🛠

[machichima]

#take

[eapolinario]

Thank you for #6084!