Fix typo

Author: iluuu1994

src/queries/query-evaluation-model-in-detail.md

@@ -73,7 +73,7 @@ not memoize the result.
 
 When the query context is created, it is still empty: No queries have been
 executed, no results are cached. But the context already provides access to
-"input" data, i.e. pieces of immutable data that where computed before the
+"input" data, i.e. pieces of immutable data that were computed before the
 context was created and that queries can access to do their computations.
 Currently this input data consists mainly of the HIR map and the command-line
 options the compiler was invoked with. In the future, inputs will just consist