Waiter documentation about error behavior is incorrect

[Shtutnik]

Describe the issue

Hi,

From what I see in the different waiter pages, it states that An error is **returned** ... although when checking the python code (for example here) it seems that actually an error is raised, not returned.

Could you please emphasize this so that developers know what behavior to expect from the wait function?

I listed some examples below, but I think this is a generic thing that applies to all waiter pages.

Links

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/ecs/waiter/ServicesStable.html
https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/ec2/waiter/ImageExists.html

[tim-finnigan]

Thanks for highlighting this. Per discussion with the team this is a reasonable wording change. I created the PR linked above (#4108) to update the wording.

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