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Add missing character to documentation for fixing the error:
Blocks of type "extra" are not expected here. Did you mean to define argument "extra"? If so, use the equals sign to assign it a value.
The example lacks an equal sign, which is the reason for the error. The solution is described in the following article. https://www.terraform.io/docs/extend/best-practices/detecting-drift.html#error-checking-aggregate-types