Fix typo

Author: petere

src/backend/executor/execMain.c

@@ -869,7 +869,7 @@ InitPlan(QueryDesc *queryDesc, int eflags)
 		/*
 		 * In the partitioned result relation case, lock the non-leaf result
 		 * relations too.  A subset of these are the roots of respective
-		 * partitioned tables, for which we also allocate ResulRelInfos.
+		 * partitioned tables, for which we also allocate ResultRelInfos.
 		 */
 		estate->es_root_result_relations = NULL;
 		estate->es_num_root_result_relations = 0;