fix: change provider docs assume_role to be list instead of object

[akozhuharov]

As per this commit the behaviour is changed from object to list

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• The resources and data sources in this provider are generated from the CloudFormation schema, so they can only support the actions that the underlying schema supports. For this reason submitted bugs should be limited to defects in the generation and runtime code of the provider. Customizing behavior of the resource, or noting a gap in behavior are not valid bugs and should be submitted as enhancements to AWS via the CloudFormation Open Coverage Roadmap.

Relates #2029.

[gdavison]

Thanks for this PR, @akozhuharov. The change in assume_role was a breaking change (see #2041), so we will be rolling it back in #2043. We will reintroduce IAM role chaining in a future release.

Since we're rolling back this change, the documentation changes will not be needed. Thanks again for the PR