Fix typo in comment.

Etsuro Fujita

Discussion: http://postgr.es/m/5f794b91-67df-1ac6-8a4f-069f8e8e169d@lab.ntt.co.jp

src/include/nodes/plannodes.h

@@ -67,7 +67,7 @@ typedef struct PlannedStmt
 
 	/*
 	 * rtable indexes of non-leaf target relations for UPDATE/DELETE on all
-	 * the partitioned table mentioned in the query.
+	 * the partitioned tables mentioned in the query.
 	 */
 	List	   *nonleafResultRelations;