Fix lint

Author: sffc

spec/abstractops.html

@@ -576,7 +576,7 @@ <h1>
       ValidateTemporalUnitValue (
         _value_: a Temporal unit, ~unset~, or ~auto~,
         _unitGroup_: ~date~, ~time~, or ~datetime~,
-        optional _extraValues_: a List of either Temporal units or ~auto~ or ~unset~,
+        optional _extraValues_: a List of either Temporal units or ~auto~,
       ): either a normal completion containing ~unused~ or a throw completion
     </h1>
     <dl class="header">