Reflect actual argument names for aws_backup_selection in docs

[grom3k]

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Complements #7382

Documentation for aws_backup_selection is not updated resulting in following error, while trying create the resource:

Error: aws_backup_selection.efs_backup: "iam_role_arn": required field is not set
Error: aws_backup_selection.efs_backup: : invalid or unknown key: iam_role
Error: aws_backup_selection.efs_backup: : invalid or unknown key: tag

I've updated the documentation to reflect proper arguments names

[bflad]

Thank you very much, @grom3k

[ghost]

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