Fix comment typo in nlj_as_hash_join.cpp (#714)

Co-authored-by: Prashanth Duvvada <[email protected]>

src/optimizer/nlj_as_hash_join.cpp

@@ -19,7 +19,7 @@ namespace bustub {
 
 auto Optimizer::OptimizeNLJAsHashJoin(const AbstractPlanNodeRef &plan) -> AbstractPlanNodeRef {
   // TODO(student): implement NestedLoopJoin -> HashJoin optimizer rule
-  // Note for 2023 Fall: You should support join keys of any number of conjunction of equi-condistions:
+  // Note for 2023 Fall: You should support join keys of any number of conjunction of equi-conditions:
   // E.g. <column expr> = <column expr> AND <column expr> = <column expr> AND ...
   return plan;
 }