docs: fix typo, it should refer to `domain_blacklist_enabled` setting

What does this MR do?

fix the documentation

Are there points in the code the reviewer needs to double check?

N/A

Why was this MR needed?

typo fix

What are the relevant issue numbers?

N/A

Screenshots (if relevant)

N/A

Does this MR meet the acceptance criteria?

yes, it's just a typo fix in the documentation without any code or business logic changes