Query Log: The underscore is special

[DL6ER]

What does this implement/fix?

Hint at the special role of the underscore character

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Related issue or feature (if applicable): pi-hole/FTL#2550

Pull request in docs with documentation (if applicable): N/A

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[PromoFaux]

Nothing blocking, this just feels more natural (to a native speaker 😏) when saying it out loud