Apply suggestions from code review

Co-authored-by: Andrew Eisenberg <aeisenberg@github.com>

extensions/ql-vscode/src/log-insights/performance-comparison.ts

@@ -124,7 +124,7 @@ export class PerformanceOverviewScanner implements EvaluationLogScanner {
       case "COMPUTED_EXTENSIONAL": {
         if (predicateName.startsWith("cached_")) {
           // Add a dependency from a cached COMPUTED_EXTENSIONAL to the predicate with the actual contents.
-          // The raHash of the this event may appear in a CACHE_HIT events in the other event log. The dependency
+          // The raHash of the this event may appear in a CACHE_HIT event in the other event log. The dependency
           // we're adding here is needed in order to associate the original predicate with such a cache hit.
           const originalName = predicateName.substring("cached_".length);
           const originalIndex = this.nameToIndex.get(originalName);

extensions/ql-vscode/src/view/compare-performance/ComparePerformance.tsx

@@ -159,7 +159,7 @@ class ComparisonDataset {
         const name = other.data.names[otherCacheHit];
         const ownIndex = this.nameToIndex.get(name);
         if (ownIndex != null) {
-          visit(ownIndex, this.data.raHashes[ownIndex]);
+          visit(ownIndex, raHashes[ownIndex]);
         }
       }
     }