fix(typos): aggregation_executor.h routine descriptions (#510)

Author: xUser5000

src/include/execution/executors/aggregation_executor.h

@@ -42,7 +42,7 @@ class SimpleAggregationHashTable {
                              const std::vector<AggregationType> &agg_types)
       : agg_exprs_{agg_exprs}, agg_types_{agg_types} {}
 
-  /** @return The initial aggregrate value for this aggregation executor */
+  /** @return The initial aggregate value for this aggregation executor */
   auto GenerateInitialAggregateValue() -> AggregateValue {
     std::vector<Value> values{};
     for (const auto &agg_type : agg_types_) {